<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0870-9025</journal-id>
<journal-title><![CDATA[Revista Portuguesa de Saúde Pública]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Port. Sau. Pub.]]></abbrev-journal-title>
<issn>0870-9025</issn>
<publisher>
<publisher-name><![CDATA[Escola Nacional de Saúde Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0870-90252016000100011</article-id>
<article-id pub-id-type="doi">10.1016/j.rpsp.2015.11.003</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[O uso de antibióticos e as resistências bacterianas: breves notas sobre a sua evolução]]></article-title>
<article-title xml:lang="en"><![CDATA[Use of antibiotics and bacterial resistances: Brief notes on its evolution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Loureiro]]></surname>
<given-names><![CDATA[Rui João]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Roque]]></surname>
<given-names><![CDATA[Fátima]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues]]></surname>
<given-names><![CDATA[António Teixeira]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herdeiro]]></surname>
<given-names><![CDATA[Maria Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramalheira]]></surname>
<given-names><![CDATA[Elmano]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de Aveiro Instituto de Biomedicina Departamento de Ciências Médicas]]></institution>
<addr-line><![CDATA[Aveiro ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico da Guarda Unidade de Investigação para o Desenvolvimento do Interior Centro de Potencial e Inovação de Recursos Naturais]]></institution>
<addr-line><![CDATA[Guarda ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidade de Coimbra Faculdade de Farmácia ]]></institution>
<addr-line><![CDATA[Coimbra ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde  ]]></institution>
<addr-line><![CDATA[Gandra ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Hospital Infante D. Pedro  ]]></institution>
<addr-line><![CDATA[Aveiro ]]></addr-line>
<country>Portugal</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>34</volume>
<numero>1</numero>
<fpage>77</fpage>
<lpage>84</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0870-90252016000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0870-90252016000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0870-90252016000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A resistência bacteriana aos antibióticos é atualmente um dos problemas de saúde pública mais relevantes a nível global, dado que apresenta consequências clínicas e económicas preocupantes, estando associada ao uso inadequado de antibióticos. Portugal é, no contexto europeu, um país com um elevado consumo de antibióticos, apesar de uma diminuição no consumo destes fármacos nos últimos anos. A resistência bacteriana tem crescido acentuadamente, sendo que as bactérias Gram-positivas mais resistentes aos antibióticos são da espécie Staphylococcus aureus e do género Enterococcus, ao passo que as bactérias Gram-negativas mais resistentes aos antibióticos são das espécies Acinetobacter baumannii, Pseudomonas aeruginosa e da família Enterobacteriaceae.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The bacterial resistance to antibiotics is actually one of the most relevant public health problems at global level, since it presents clinical and economic worrying consequences, and is associated with the inappropriate use of antibiotics. Portugal is, in the European context, a country with high antibiotic consumption, despite a decrease in the consumption of these drugs in the last years. The bacterial resistance to antibiotics has markedly increased being Staphylococcus aureus and Enterococcus the Gram-positive bacteria more resistant to antibiotics, whereas the Gram-negative bacteria more resistant to antibiotics belong to the Acinetobacter baumannii, Pseudomonas aeruginosa species and the Enterobacteriaceae family.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[Antibióticos]]></kwd>
<kwd lng="pt"><![CDATA[Resistência bacteriana]]></kwd>
<kwd lng="pt"><![CDATA[Portugal]]></kwd>
<kwd lng="pt"><![CDATA[Bactérias]]></kwd>
<kwd lng="en"><![CDATA[Antibiotics]]></kwd>
<kwd lng="en"><![CDATA[Bacterial resistance]]></kwd>
<kwd lng="en"><![CDATA[Portugal]]></kwd>
<kwd lng="en"><![CDATA[Bacteria]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P align="right"><b>ARTIGO DE REVISÃO</b></P>     <p>&nbsp;</p>     <p><b>O uso de antibi&oacute;ticos e as resist&ecirc;ncias bacterianas: breves notas sobre a sua evolu&ccedil;&atilde;o</b></p>     <p><b>Use of antibiotics and bacterial resistances: Brief notes on its evolution</b></p>     <p>&nbsp;</p>     <p><b>Rui Jo&atilde;o Loureiro <sup>a</sup><sup>, </sup><a href="#c0">*</a><a name="topc0"></a>, F&aacute;tima Roque <sup>a</sup><sup>, </sup><sup>b</sup>, Ant&oacute;nio Teixeira Rodrigues <sup>a</sup><sup>, </sup><sup>c</sup>, Maria Teresa Herdeiro <sup>a</sup><sup>, </sup><sup>d</sup>, Elmano Ramalheira <sup>e</sup></b></p>     <p>a Departamento de Ci&ecirc;ncias M&eacute;dicas, Instituto de Biomedicina - iBiMED, Universidade de Aveiro, Aveiro, Portugal</p>     <p>b Centro de Potencial e Inova&ccedil;&atilde;o de Recursos Naturais (CPIRN) da Unidade de Investiga&ccedil;&atilde;o para o Desenvolvimento do Interior, Instituto Polit&eacute;cnico da Guarda (UDI/IPG), Guarda, Portugal</p>     <p>c Faculdade de Farm&aacute;cia da Universidade de Coimbra, Coimbra, Portugal</p>     <p>d CESPU, IINFACTS, Instituto de Investiga&ccedil;&atilde;o e Forma&ccedil;&atilde;o Avan&ccedil;ada em Ci&ecirc;ncias e Tecnologias da Sa&uacute;de, Gandra, Portugal</p>     ]]></body>
<body><![CDATA[<p>e Hospital Infante D. Pedro, EPE, Aveiro, Portugal</p>     <p>&nbsp;</p>     <p><b>RESUMO</b></p>     <p>A resist&ecirc;ncia bacteriana aos antibi&oacute;ticos &eacute; atualmente um dos problemas de sa&uacute;de p&uacute;blica mais relevantes a n&iacute;vel global, dado que apresenta consequ&ecirc;ncias cl&iacute;nicas e econ&oacute;micas preocupantes, estando associada ao uso inadequado de antibi&oacute;ticos. Portugal &eacute;, no contexto europeu, um pa&iacute;s com um elevado consumo de antibi&oacute;ticos, apesar de uma diminui&ccedil;&atilde;o no consumo destes f&aacute;rmacos nos &uacute;ltimos anos. A resist&ecirc;ncia bacteriana tem crescido acentuadamente, sendo que as bact&eacute;rias Gram-positivas mais resistentes aos antibi&oacute;ticos s&atilde;o da esp&eacute;cie <i>Staphylococcus aureus</i> e do g&eacute;nero <i>Enterococcus</i>, ao passo que as bact&eacute;rias Gram-negativas mais resistentes aos antibi&oacute;ticos s&atilde;o das esp&eacute;cies <i>Acinetobacter baumannii</i>, <i>Pseudomonas aeruginosa</i> e da fam&iacute;lia <i>Enterobacteriaceae</i>.</p>     <p><b>Palavras-chave: </b>Antibi&oacute;ticos. Resist&ecirc;ncia bacteriana. Portugal. Bact&eacute;rias.</p>     <p>&nbsp;</p>     <p><b>ABSTRACT</b></p>     <p>The bacterial resistance to antibiotics is actually one of the most relevant public health problems at global level, since it presents clinical and economic worrying consequences, and is associated with the inappropriate use of antibiotics. Portugal is, in the European context, a country with high antibiotic consumption, despite a decrease in the consumption of these drugs in the last years. The bacterial resistance to antibiotics has markedly increased being <i>Staphylococcus aureus</i> and <i>Enterococcus</i> the Gram-positive bacteria more resistant to antibiotics, whereas the Gram-negative bacteria more resistant to antibiotics belong to the <i>Acinetobacter baumannii</i>, <i>Pseudomonas aeruginosa</i> species and the <i>Enterobacteriaceae</i> family.</p>     <p><b>Keywords: </b>Antibiotics. Bacterial resistance. Portugal. Bacteria.</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><b>Introdu&ccedil;&atilde;o</b></p>     <p>A resist&ecirc;ncia bacteriana aos antibi&oacute;ticos &eacute; atualmente um dos problemas de sa&uacute;de p&uacute;blica mais relevantes, uma vez que muitas bact&eacute;rias anteriormente suscet&iacute;veis aos antibi&oacute;ticos usualmente utilizados deixaram de responder a esses mesmos agentes<sup>1</sup>. O desenvolvimento de resist&ecirc;ncia bacteriana aos antibi&oacute;ticos &eacute; um fen&oacute;meno natural resultante da press&atilde;o seletiva exercida pelo uso de antibi&oacute;ticos, mas que tem sofrido uma expans&atilde;o muito acelerada devido &agrave; utiliza&ccedil;&atilde;o inadequada destes f&aacute;rmacos, existindo uma correla&ccedil;&atilde;o muito clara entre um maior consumo de antibi&oacute;ticos e n&iacute;veis mais elevados de resist&ecirc;ncia microbiana<sup>1</sup>.</p>     <p>A resist&ecirc;ncia aos antibi&oacute;ticos &eacute; respons&aacute;vel por consequ&ecirc;ncias cl&iacute;nicas<sup>1&ndash;4</sup> e econ&oacute;micas<sup>1,5,6</sup> graves, relacionadas com o aumento da morbilidade e mortalidade<sup>1&ndash;4</sup>, devido aos atrasos na administra&ccedil;&atilde;o de tratamentos eficazes contra as infe&ccedil;&otilde;es causadas por bact&eacute;rias resistentes<sup>1</sup>. Por sua vez, a hospitaliza&ccedil;&atilde;o prolongada e o uso de antibi&oacute;ticos diferentes dos de primeira linha aumentam tamb&eacute;m, de forma acentuada, os custos dos cuidados de sa&uacute;de<sup>1</sup>, o que constitui um problema particularmente relevante, considerando os recursos finitos que sustentam os sistemas de sa&uacute;de e tendo em conta a atual conjuntura de crise econ&oacute;mica e financeira.</p>     <p>Tendo em conta a import&acirc;ncia do problema da resist&ecirc;ncia microbiana e a sua crescente amea&ccedil;a para a sa&uacute;de p&uacute;blica a n&iacute;vel mundial, v&aacute;rias organiza&ccedil;&otilde;es nacionais, como a Dire&ccedil;&atilde;o-Geral de Sa&uacute;de, e internacionais, como a Comiss&atilde;o Europeia e a Organiza&ccedil;&atilde;o Mundial de Sa&uacute;de, reconheceram a relev&acirc;ncia do estudo da emerg&ecirc;ncia da resist&ecirc;ncia microbiana e do desenvolvimento de sistemas de vigil&acirc;ncia e controlo da resist&ecirc;ncia microbiana, como o Programa de Preven&ccedil;&atilde;o e Controlo de Infe&ccedil;&otilde;es e de Resist&ecirc;ncia aos Antimicrobianos<sup>7</sup>, a n&iacute;vel nacional, e o Sistema Europeu de Vigil&acirc;ncia da Resist&ecirc;ncia Microbiana (&laquo;European Antimicrobial Resistance Surveillance System (EARSS)&raquo;)<sup>8</sup>, a n&iacute;vel europeu.</p>     <p>Este trabalho pretende, assim, alertar para a import&acirc;ncia do problema da resist&ecirc;ncia microbiana na sa&uacute;de p&uacute;blica atualmente, analisando fatores que podem influenciar o consumo de antibi&oacute;ticos e, consequentemente, o n&iacute;vel de resist&ecirc;ncia aos mesmos. Apresenta-se uma revis&atilde;o da evolu&ccedil;&atilde;o da resist&ecirc;ncia microbiana no contexto mundial, europeu e nacional.</p>     <p><b>Consumo de antibi&oacute;ticos em Portugal e na Europa</b></p>     <p>Segundo os dados divulgados no relat&oacute;rio &laquo;European Centre for Disease Prevention and Control (ECDC) Surveillance Report: Surveillance of antimicrobial consumption in Europe, 2012&raquo;, existe uma grande variabilidade no consumo de antibi&oacute;ticos na Europa, avaliado em doses di&aacute;rias definidas (DDD) /1.000 habitantes /dia (DHD)<sup>9</sup>. O pa&iacute;s com maior consumo de antibi&oacute;ticos, a Gr&eacute;cia (31,9 DHD), apresenta um valor em DHD cerca de 3 vezes superior ao pa&iacute;s com menor consumo, a Holanda (11,3 DHD). Observa-se tamb&eacute;m que o maior n&iacute;vel de consumo de antibi&oacute;ticos ocorre nos pa&iacute;ses do sul da Europa, comparativamente com os pa&iacute;ses do norte da Europa (<a href ="/img/revistas/rpsp/v34n1/34n1a11f1.jpg">fig. 1</a>)<sup>9</sup>.</p>     
<p>Considerando a utiliza&ccedil;&atilde;o relativa dos diferentes grupos de antibi&oacute;ticos, verifica-se que as penicilinas constituem o grupo mais utilizado na comunidade em todos os pa&iacute;ses, variando o seu uso de 30% (Alemanha) a 67% (Eslov&eacute;nia). Por sua vez, o uso de cefalosporinas varia de 0,2% (Dinamarca) a 23,5% (Malta), o uso de tetraciclinas de menos de 1,9% (It&aacute;lia) a 24,4% (Su&eacute;cia), o uso de macr&oacute;lidos-lincosamidas-streptograminas (MLS) de 4,4% (Su&eacute;cia) a 24,5% (Eslov&aacute;quia) e o uso das quinolonas de 2,1% (Reino Unido) a 13,9% (Hungria) do uso total de antibi&oacute;ticos em ambulat&oacute;rio<sup>9</sup>.</p>     <p>T&ecirc;m sido apontadas in&uacute;meras raz&otilde;es para explicar as diferen&ccedil;as no consumo de antibi&oacute;ticos entre os pa&iacute;ses europeus, destacando-se a incid&ecirc;ncia de infe&ccedil;&otilde;es adquiridas na comunidade e os fatores que podem levar a diferen&ccedil;as nessa incid&ecirc;ncia, determinantes culturais e sociais, organiza&ccedil;&atilde;o das estruturas prestadoras de cuidados de sa&uacute;de, os recursos humanos e financeiros dispon&iacute;veis e a sua utiliza&ccedil;&atilde;o, o conhecimento acerca dos antibi&oacute;ticos, o mercado farmac&ecirc;utico e as pr&aacute;ticas de regulamenta&ccedil;&atilde;o existentes<sup>10</sup>.</p>     <p>Segundo dados do relat&oacute;rio &laquo;ECDC Surveillance Report: Surveillance of antimicrobial consumption in Europe, 2012&raquo;, verifica-se que no per&iacute;odo entre 2002-2012 a taxa do consumo de antibi&oacute;ticos em Portugal apresentou uma tend&ecirc;ncia de decr&eacute;scimo de 26,5 DHD para 22,7 DHD, sendo que, apesar desta redu&ccedil;&atilde;o na utiliza&ccedil;&atilde;o de antibi&oacute;ticos, Portugal continuou a apresentar um consumo elevado relativamente a outros pa&iacute;ses europeus, sendo superior &agrave; m&eacute;dia dos valores de consumo (20,4 DHD) dos pa&iacute;ses que integram o projeto &laquo;Vigil&acirc;ncia Europeia do Consumo de Antimicrobianos&raquo; (&laquo;European Surveillance of Antimicrobial Consumption&raquo; (ESAC))<sup>9</sup>.</p>     ]]></body>
<body><![CDATA[<p>Tendo em conta a utiliza&ccedil;&atilde;o dos diferentes grupos de antibi&oacute;ticos em Portugal, verifica-se que, segundo dados do relat&oacute;rio &laquo;ECDC Surveillance Report: Surveillance of antimicrobial consumption in Europe, 2012&raquo;, as penicilinas constituem o grupo de antibi&oacute;ticos mais utilizado (12,4 DHD), seguindo-se o grupo dos MLS (3,2 DHD), sendo que os grupos menos utilizados s&atilde;o as tetraciclinas (1,1 DHD) e a associa&ccedil;&atilde;o de sulfonamidas e trimetoprim (0,5 DHD)<sup>9</sup>. Estes dados est&atilde;o de acordo com dados de outros pa&iacute;ses europeus, particularmente de pa&iacute;ses do sul da Europa<sup>9</sup>. &Eacute; de notar que, entre 2000-2012, se verificou uma diminui&ccedil;&atilde;o do consumo nos grupos das cefalosporinas, quinolonas e macr&oacute;lidos, enquanto ocorreu um aumento do consumo no grupo das penicilinas, o grupo mais utilizado e que constitui, frequentemente, a primeira linha de tratamento para muitas infe&ccedil;&otilde;es bacterianas<sup>9,11</sup>.</p>     <p><b>Uso inadequado de antibi&oacute;ticos e a sua rela&ccedil;&atilde;o com o aparecimento de resist&ecirc;ncias</b></p>     <p>O uso inapropriado dos antibi&oacute;ticos, particularmente a sua utiliza&ccedil;&atilde;o excessiva, tem sido considerado um dos fatores que mais contribui para o problema da resist&ecirc;ncia microbiana<sup>2,12&ndash;15</sup>, constituindo um s&eacute;rio problema de sa&uacute;de p&uacute;blica global, dado que tem aumentado a frequ&ecirc;ncia de doen&ccedil;as infeciosas estabelecidas e emergentes em consequ&ecirc;ncia da inefic&aacute;cia dos antibi&oacute;ticos<sup>16</sup>. Dessa forma, verifica-se que os pa&iacute;ses do norte da Europa, que apresentam um menor consumo de antibi&oacute;ticos, s&atilde;o tamb&eacute;m os pa&iacute;ses onde o n&iacute;vel de resist&ecirc;ncia &eacute; menor, verificando-se o oposto nos pa&iacute;ses do sul da Europa, incluindo Portugal<sup>12</sup>. Com efeito, o consumo inadequado de antibi&oacute;ticos tem custos elevados para a sociedade e consequ&ecirc;ncias nefastas para a sa&uacute;de, como a diminui&ccedil;&atilde;o da efic&aacute;cia dos tratamentos, o prolongamento das doen&ccedil;as, o crescimento do n&uacute;mero de hospitaliza&ccedil;&otilde;es<sup>14,17</sup> e o aumento da morbilidade e mortalidade<sup>2,14,16,17</sup>.</p>     <p>T&ecirc;m sido apontados v&aacute;rios fatores que podem levar &agrave; prescri&ccedil;&atilde;o inadequada de antibi&oacute;ticos, destacando-se a incerteza no diagn&oacute;stico<sup>14,18&ndash;20</sup>, a press&atilde;o exercida sobre os m&eacute;dicos por parte dos doentes e/ou seus familiares, e a exist&ecirc;ncia de muitas consultas por dia, o que dificulta a precis&atilde;o do diagn&oacute;stico e da terap&ecirc;utica e aumenta a prescri&ccedil;&atilde;o de antibi&oacute;ticos pelos m&eacute;dicos<sup>14,18,21</sup>. Para al&eacute;m disso, existem n&iacute;veis elevados de n&atilde;o ades&atilde;o &agrave; terap&ecirc;utica por parte dos doentes, em que os doentes tomam doses diferentes ou por per&iacute;odos diferentes do que o prescrito<sup>16</sup>, a par de um n&iacute;vel elevado de automedica&ccedil;&atilde;o, em que os doentes utilizam frequentemente antibi&oacute;ticos de tratamentos anteriores ou obtidos na farm&aacute;cia sem prescri&ccedil;&atilde;o m&eacute;dica<sup>14,16,22&ndash;26</sup>. A pr&aacute;tica de automedica&ccedil;&atilde;o entre a popula&ccedil;&atilde;o resulta de caracter&iacute;sticas culturais, cren&ccedil;as e conhecimentos sobre os antibi&oacute;ticos, o que pode ser constatado quando se observa que grande parte da popula&ccedil;&atilde;o desconhece que os antibi&oacute;ticos apenas atuam nas infe&ccedil;&otilde;es bacterianas, consumindo antibi&oacute;ticos para tratar infe&ccedil;&otilde;es virais comuns como a gripe<sup>14,23,27</sup>.</p>     <p>&Eacute; ainda importante salientar que uma propor&ccedil;&atilde;o consider&aacute;vel do uso inadequado de antibi&oacute;ticos, que tem tamb&eacute;m um importante papel na emerg&ecirc;ncia e dissemina&ccedil;&atilde;o da resist&ecirc;ncia bacteriana aos antibi&oacute;ticos, &eacute; devida ao uso de antibi&oacute;ticos em atividades como a veterin&aacute;ria, a zootecnia e a pecu&aacute;ria, verificando-se que aproximadamente 50% da totalidade dos agentes antimicrobianos consumidos na Uni&atilde;o Europeia n&atilde;o s&atilde;o utilizados em humanos<sup>28</sup>. Efetivamente, verifica-se que, em pa&iacute;ses onde o antibi&oacute;tico avoparcina, semelhante &agrave; vancomicina, foi usado na produ&ccedil;&atilde;o animal, ocorreu um aumento do n&iacute;vel de <i>Enterococcus</i> resistentes &agrave; vancomicina na flora intestinal dos animais de consumo tratados com avoparcina, assim como na flora fecal de humanos saud&aacute;veis e de animais dom&eacute;sticos<sup>28,29</sup>. Posteriormente, verificou-se uma diminui&ccedil;&atilde;o do n&iacute;vel de resist&ecirc;ncias ap&oacute;s a aboli&ccedil;&atilde;o do uso da avoparcina na produ&ccedil;&atilde;o animal pela Uni&atilde;o Europeia<sup>28,30</sup>. Dessa forma, a transmiss&atilde;o horizontal de genes de resist&ecirc;ncia atrav&eacute;s de elementos gen&eacute;ticos m&oacute;veis, como plasm&iacute;deos, transpos&otilde;es e integr&otilde;es, entre diferentes esp&eacute;cies e g&eacute;neros bacterianos, patog&eacute;nicos e n&atilde;o patog&eacute;nicos, assim como a transmiss&atilde;o subsequente dessas bact&eacute;rias entre v&aacute;rios hospedeiros e reservat&oacute;rios ambientais, parece desempenhar um papel importante na emerg&ecirc;ncia e dissemina&ccedil;&atilde;o da resist&ecirc;ncia bacteriana aos antibi&oacute;ticos<sup>28,31</sup>.</p>     <p><b>Evolu&ccedil;&atilde;o da resist&ecirc;ncia microbiana a n&iacute;vel mundial</b></p>     <p>Desde a introdu&ccedil;&atilde;o da utiliza&ccedil;&atilde;o dos antibi&oacute;ticos que o n&iacute;vel de resist&ecirc;ncia microbiana tem crescido progressivamente, tendo aumentado acentuadamente nos &uacute;ltimos 15 anos<sup>13</sup>. Os 4 principais mecanismos de resist&ecirc;ncia bacteriana aos antibi&oacute;ticos s&atilde;o: a modifica&ccedil;&atilde;o ou destrui&ccedil;&atilde;o enzim&aacute;tica do antibi&oacute;tico (ex: destrui&ccedil;&atilde;o dos agentes &szlig;-lact&acirc;micos pelas enzimas &szlig;-lactamases); a preven&ccedil;&atilde;o da acumula&ccedil;&atilde;o intracelular do antibi&oacute;tico atrav&eacute;s da redu&ccedil;&atilde;o da permeabilidade celular ao antibi&oacute;tico (ex: resist&ecirc;ncia da bact&eacute;ria <i>Pseudomonas aeruginosa</i> (<i>P. aeruginosa)</i> ao imipenem) ou da exist&ecirc;ncia de bombas de efluxo dos antibi&oacute;ticos das c&eacute;lulas bacterianas (ex: resist&ecirc;ncia da fam&iacute;lia das enterobacteri&aacute;ceas &agrave;s tetraciclinas); as altera&ccedil;&otilde;es nas mol&eacute;culas alvo dos antibi&oacute;ticos (ex: resist&ecirc;ncia intr&iacute;nseca das bact&eacute;rias do g&eacute;nero <i>Enterococcus</i> &agrave;s cefalosporinas), e a produ&ccedil;&atilde;o de mol&eacute;culas alvo alternativas que n&atilde;o s&atilde;o inibidas pelo antibi&oacute;tico, enquanto se continua a produzir as mol&eacute;culas alvo originais, contornando desse modo a inibi&ccedil;&atilde;o induzida pelo antibi&oacute;tico (ex: resist&ecirc;ncia da bact&eacute;ria <i>Staphylococcus aureus</i> (<i>S. aureus</i>) &agrave; meticilina)<sup>32,33</sup>.</p>     <p>Considerando a evolu&ccedil;&atilde;o da resist&ecirc;ncia aos antibi&oacute;ticos nas bact&eacute;rias Gram-positivas, verifica-se que a esp&eacute;cie <i>S. aureus</i><sup>13,34</sup> e o g&eacute;nero <i>Enterococcus</i> s&atilde;o as bact&eacute;rias Gram-positivas que apresentam maiores problemas de resist&ecirc;ncia aos antibi&oacute;ticos<sup>13</sup>.</p>     <p>Relativamente &agrave; esp&eacute;cie <i>S. aureus</i>, &eacute; de salientar que as primeiras estirpes produtoras de penicilinases e que eram tamb&eacute;m resistentes aos outros antibi&oacute;ticos usualmente dispon&iacute;veis causaram problemas cl&iacute;nicos consider&aacute;veis na d&eacute;cada de 50, que levaram &agrave; introdu&ccedil;&atilde;o da meticilina e de outras penicilinas semissint&eacute;ticas, resultando numa redu&ccedil;&atilde;o acentuada dessas estirpes<sup>13</sup>. No entanto, pouco tempo depois da introdu&ccedil;&atilde;o da meticilina em 1960, foram isoladas amostras de <i>S. aureus</i> resistentes &agrave; meticilina (MRSA) no Reino Unido, o que marcou o aparecimento das estirpes de <i>S. aureus</i> resistentes &agrave; meticilina (&laquo;methicillin-resistant <i>S. aureus</i>&raquo;)<sup>34&ndash;36</sup>, que posteriormente se disseminaram a n&iacute;vel mundial<sup>13,34,35,37</sup>.</p>     <p>A informa&ccedil;&atilde;o da preval&ecirc;ncia de MRSA em in&uacute;meros pa&iacute;ses revela uma grande varia&ccedil;&atilde;o, desde cerca de 1,0% em pa&iacute;ses como a Holanda at&eacute; n&iacute;veis de 25,0-50,0% em muitos pa&iacute;ses do continente americano, na Austr&aacute;lia e em alguns pa&iacute;ses do sul da Europa<sup>13,35,37</sup>.</p>     ]]></body>
<body><![CDATA[<p>Relativamente &agrave;s bact&eacute;rias do g&eacute;nero <i>Enterococcus</i>, verifica-se que, apesar de apresentarem normalmente uma baixa virul&ecirc;ncia, estas bact&eacute;rias podem causar infe&ccedil;&otilde;es em doentes imunodeprimidos, particularmente naqueles que estiveram submetidos a tratamentos com antibi&oacute;ticos<sup>13</sup>. O aparecimento de <i>Enterococcus faecium</i> resistentes &agrave; vancomicina em 1986, no Reino Unido, precedeu o aparecimento nos Estados Unidos e, depois, noutras regi&otilde;es do mundo, de bact&eacute;rias do g&eacute;nero <i>Enterococcus</i> altamente resistentes e causadoras de infe&ccedil;&otilde;es dif&iacute;ceis de tratar<sup>13,37,38</sup>. Nos Estados Unidos verificou-se o aparecimento de surtos causados por v&aacute;rios clones, em que existe um elevado n&uacute;mero de portadores assintom&aacute;ticos e de doentes infetados provenientes da comunidade admitidos nos hospitais, pelo que um controlo de infe&ccedil;&otilde;es eficaz &eacute; bastante dif&iacute;cil<sup>13,39,40</sup>.</p>     <p>Considerando a evolu&ccedil;&atilde;o da resist&ecirc;ncia aos antibi&oacute;ticos nas bact&eacute;rias Gram-negativas, verifica-se que o mais importante mecanismo de resist&ecirc;ncia aos antibi&oacute;ticos nestas bact&eacute;rias &eacute; a produ&ccedil;&atilde;o de enzimas &szlig;-lactamases<sup>34</sup>. Relativamente &agrave; fam&iacute;lia das enterobacteri&aacute;ceas, &eacute; de referir que, ap&oacute;s a introdu&ccedil;&atilde;o da ampicilina na d&eacute;cada de 1960, a resist&ecirc;ncia aos agentes &szlig;-lact&acirc;micos tornou-se um importante problema cl&iacute;nico, devido &agrave; transfer&ecirc;ncia por plasm&iacute;deos de genes de resist&ecirc;ncia codificando &szlig;-lactamases de serina temoniera (TEM) e &laquo;sulfhydryl variable&raquo; (SHV)<sup>13</sup>.</p>     <p>Nos anos 80, ap&oacute;s a introdu&ccedil;&atilde;o das cefalosporinas de terceira gera&ccedil;&atilde;o, foram reportados genes TEM e SHV mutados, que se disseminaram principalmente entre o g&eacute;nero <i>Klebsiella</i> spp e a esp&eacute;cie <i>Escherichia coli</i> (<i>E. coli</i>), o que marcou a emerg&ecirc;ncia das estirpes produtoras de &szlig;-lactamases de largo espectro (ESBL &ndash; &laquo;extended spectrum &szlig;-lactamases&raquo;), que se definem por serem capazes de hidrolisar cefalosporinas de terceira gera&ccedil;&atilde;o e monobactamos<sup>13,34,41</sup>.</p>     <p>Posteriormente, surgiu uma nova fam&iacute;lia de &szlig;-lactamases, designada como enzimas &laquo;cefotaximases Munich&raquo; (CTX-M), que se disseminou por todos os continentes<sup>13,42</sup>. Na Europa, verificaram-se na &uacute;ltima d&eacute;cada (2000-2010) altera&ccedil;&otilde;es consider&aacute;veis nos tipos de ESBL com maior preval&ecirc;ncia, com as estirpes produtoras de CTX-M a tornarem-se dominantes, particularmente as de CTX-M-15, dominantes no Reino Unido e em Fran&ccedil;a, e as de CTX-M-14, frequentes em Espanha<sup>13,34</sup>. &Eacute; de salientar que o aumento do uso de carbapenemos no tratamento de infe&ccedil;&otilde;es por enterobacteri&aacute;ceas multirresistentes tem levado ao aumento da dissemina&ccedil;&atilde;o da resist&ecirc;ncia a estes agentes<sup>13,34</sup>, a qual &eacute; mediada pela transfer&ecirc;ncia de enzimas carbapenemases (que destroem os carbapenemos), particularmente das fam&iacute;lias imipenemases (IMP) e &laquo;Verona integron-encoded metallo- &szlig; lactamases&raquo; (VIM), atrav&eacute;s de plasm&iacute;deos<sup>13,34,37,43</sup>.</p>     <p>Existem ainda outras bact&eacute;rias Gram-negativas associadas a problemas de resist&ecirc;ncia aos antibi&oacute;ticos, tais como as pertencentes aos g&eacute;neros <i>Pseudomonas</i> (principalmente a bact&eacute;ria <i>Pseudomonas aeruginosa</i> (<i>P. aeruginosa</i>)) e <i>Acinetobacter</i> (particularmente a esp&eacute;cie <i>Acinetobacter baumannii</i> (<i>A. baumannii</i>))<sup>13,34,37</sup>. As bact&eacute;rias da esp&eacute;cie <i>P. aeruginosa</i> e da esp&eacute;cie <i>A. baumannii</i> s&atilde;o bact&eacute;rias ambientais altamente disseminadas, que causam problemas significativos em doentes imunodeprimidos e em doentes internados em unidades de cuidados intensivos hospitalares, onde existem reservat&oacute;rios destas bact&eacute;rias<sup>13,44,45</sup>.</p>     <p>As bact&eacute;rias <i>P. aeruginosa</i> apresentam resist&ecirc;ncia &agrave; maioria dos agentes &szlig;-lact&acirc;micos e &agrave;s fluoroquinolonas, o que fez com que os carbapenemos fossem usados crescentemente para o tratamento de infe&ccedil;&otilde;es por <i>Pseudomonas</i>, levando &agrave; dissemina&ccedil;&atilde;o da resist&ecirc;ncia destas bact&eacute;rias mediada pelas carbapenemases dos tipos VIM e IMP por todo o mundo<sup>13,34</sup>.</p>     <p>As bact&eacute;rias do g&eacute;nero <i>Acinetobacter</i> produzem uma grande variedade de &szlig;-lactamases e apresentam um largo espectro de mecanismos intr&iacute;nsecos de resist&ecirc;ncia, pelo que algumas estirpes s&atilde;o resistentes a todos os antibi&oacute;ticos conhecidos, exceto &agrave; colistina<sup>13,37</sup>.</p>     <p><b>Evolu&ccedil;&atilde;o da resist&ecirc;ncia microbiana em Portugal e o seu enquadramento no contexto europeu</b></p>     <p>Considerando a evolu&ccedil;&atilde;o da resist&ecirc;ncia microbiana em Portugal, observa-se que, &agrave; semelhan&ccedil;a do que acontece a n&iacute;vel mundial, as bact&eacute;rias patog&eacute;nicas mais resistentes aos antibi&oacute;ticos em Portugal s&atilde;o: MRSA, <i>Enterococcus</i> resistentes &agrave; vancomicina, <i>Streptococcus pneumoniae</i> (<i>S. pneumoniae</i>) resistentes &agrave; penicilina, enterobacteri&aacute;ceas produtoras de ESBL ou de carbapenemases, e <i>P. aeruginosa</i> e <i>A. baumannii</i> resistentes aos carbapenemos<sup>46</sup>.</p>     <p>A <a href ="/img/revistas/rpsp/v34n1/34n1a11t1.jpg">tabela 1</a> apresenta dados do Centro Europeu de Preven&ccedil;&atilde;o e Controlo de Doen&ccedil;as relativos aos perfis de resist&ecirc;ncia microbiana em Portugal, nos anos de 2003-2013<sup>47</sup>.</p>     
]]></body>
<body><![CDATA[<p>Relativamente ao n&iacute;vel de resist&ecirc;ncia &agrave; meticilina da esp&eacute;cie <i>S. aureus</i>, observa-se que este aumentou entre 2003-2013 (de 45,0 para 47,0%), embora tendo descido em 2013 face ao n&iacute;vel superior a 50% verificado nos anos anteriores, o que constitui um n&iacute;vel de resist&ecirc;ncia que compromete seriamente o uso das penicilinas para o tratamento de infe&ccedil;&otilde;es por <i>S. aureus</i>, particularmente tendo em conta que Portugal &eacute; o terceiro pa&iacute;s da Europa com um n&iacute;vel de resist&ecirc;ncia mais elevado<sup>47</sup>. Este fen&oacute;meno foi observado em 2005 por Amorim et al.<sup>48</sup>, num estudo sobre o perfil de resist&ecirc;ncia desta bact&eacute;ria &agrave; meticilina num hospital portugu&ecirc;s, onde se verificou um n&iacute;vel de resist&ecirc;ncia de 55%.</p>     <p>Considerando o n&iacute;vel de resist&ecirc;ncia &agrave; vancomicina das bact&eacute;rias do g&eacute;nero <i>Enterococcus</i> (particularmente da esp&eacute;cie <i>Enterococcus faecium</i>), verifica-se que este diminuiu para aproximadamente metade (de 47,0 para 22,0% das amostras isoladas) no per&iacute;odo compreendido entre 2003-2013, sendo que, ainda assim, Portugal apresenta um valor bastante superior ao valor do conjunto dos pa&iacute;ses europeus (8,9%), sendo um dos pa&iacute;ses europeus com maior n&iacute;vel de resist&ecirc;ncia destas bact&eacute;rias &agrave; vancomicina<sup>47</sup>.</p>     <p>Relativamente &agrave; taxa de resist&ecirc;ncia &agrave; penicilina da esp&eacute;cie <i>S. pneumoniae</i>, observa-se que esta diminuiu entre 2003-2013, apresentando um valor relativamente baixo (7,6% em 2013) e inferior ao valor do conjunto dos pa&iacute;ses europeus (13,6%), existindo alguns pa&iacute;ses europeus com valores bastante superiores (ex: Espanha (27,6%) e Fran&ccedil;a (22,4%))<sup>47</sup>. Em 2007, Correa et al.<sup>49</sup> realizaram um estudo num hospital em Espanha, onde verificaram uma taxa de resist&ecirc;ncia de 17,9%, valor superior ao apresentado por Portugal e ao apresentado pelo conjunto dos pa&iacute;ses europeus.</p>     <p>Considerando o n&iacute;vel de resist&ecirc;ncia da esp&eacute;cie <i>E. coli</i> a antibi&oacute;ticos habitualmente usados, observa-se que este aumentou no per&iacute;odo entre 2003-2013, sendo que o valor de resist&ecirc;ncia &agrave;s cefalosporinas de terceira gera&ccedil;&atilde;o em 2013 (14,9%) &eacute; superior ao valor do conjunto dos pa&iacute;ses europeus (12,6%), existindo, por&eacute;m, muitos pa&iacute;ses europeus com valores superiores de resist&ecirc;ncia a estes agentes (ex: Bulg&aacute;ria (39,6%) e It&aacute;lia (26,2%)), causada em grande parte pela produ&ccedil;&atilde;o de ESBL<sup>47</sup>. Picozzi et al. realizaram um estudo entre janeiro de 2008 e dezembro de 2010 em hospitais de Mil&atilde;o, em It&aacute;lia, onde observaram um n&iacute;vel de <i>E. coli</i> produtoras de ESBL superior aos valores verificados em Portugal e no conjunto dos pa&iacute;ses europeus<sup>50</sup>.</p>     <p>Em rela&ccedil;&atilde;o &agrave; esp&eacute;cie <i>Klebsiella pneumoniae</i> (<i>K. pneumoniae</i>), verifica-se que, no per&iacute;odo entre 2005-2013, ocorreu um grande aumento da resist&ecirc;ncia desta bact&eacute;ria a antibi&oacute;ticos habitualmente usados como os aminoglicos&iacute;deos (de &lt; 1,0 para 30,3% do total das amostras isoladas), apesar de existirem v&aacute;rios pa&iacute;ses europeus (ex: Pol&oacute;nia (58,4%) e Eslov&aacute;quia (64,0%)) com valores mais elevados em 2013, e as fluoroquinolonas (de &lt; 1,0 para 35,7% do total das amostras isoladas), existindo, no entanto, muitos pa&iacute;ses europeus (ex: Gr&eacute;cia (67,6%) e Pol&oacute;nia (70,1%)) com valores mais elevados em 2013<sup>47</sup>. Neonakis et al.<sup>51</sup> realizaram um estudo num hospital universit&aacute;rio da Gr&eacute;cia, em 2008, em que observaram um n&iacute;vel de resist&ecirc;ncia da <i>K. pneumoniae</i> &agrave;s fluoroquinolonas de 64%, o que corrobora o elevado n&iacute;vel de resist&ecirc;ncia desta esp&eacute;cie &agrave;s fluoroquinolonas na Gr&eacute;cia.</p>     <p>Considerando o n&iacute;vel de resist&ecirc;ncia aos antibi&oacute;ticos da esp&eacute;cie <i>P. aeruginosa</i>, verifica-se que ocorreu uma diminui&ccedil;&atilde;o do n&iacute;vel de resist&ecirc;ncia na maioria das classes de antibi&oacute;ticos habitualmente usadas entre 2006-2013, apesar dessa diminui&ccedil;&atilde;o ter sido pouco acentuada (ex: resist&ecirc;ncia aos carbapenemos desceu de 21,0 para 20,6%), sendo que o valor da resist&ecirc;ncia aos carbapenemos era, em 2013, superior ao valor do conjunto dos pa&iacute;ses europeus (17,6%), apesar de existirem pa&iacute;ses europeus com valores mais elevados (ex: Gr&eacute;cia (49,3%) e It&aacute;lia (25,9%))<sup>47</sup>.</p>     <p>&Eacute; importante salientar que os dados divulgados no relat&oacute;rio &laquo;SURVEILLANCE REPORT: Antimicrobial resistance surveillance in Europe, 2013&raquo; referem-se exclusivamente a isolados provenientes de bacteriemias e de infe&ccedil;&otilde;es no l&iacute;quido cefalorraquidiano, excluindo todos os outros isolados provenientes de outras infe&ccedil;&otilde;es comuns, como as infe&ccedil;&otilde;es respirat&oacute;rias ou urin&aacute;rias, pelo que estes resultados apresentam uma importante limita&ccedil;&atilde;o.</p>     <p>Relativamente ao n&iacute;vel de resist&ecirc;ncia na esp&eacute;cie <i>A. baumannii</i>, dados da Dire&ccedil;&atilde;o-Geral de Sa&uacute;de relativos &agrave;s unidades de cuidados intensivos hospitalares<sup>11</sup> revelam que este apresentou uma tend&ecirc;ncia de crescimento entre 2006-2009, atingindo valores muito elevados de resist&ecirc;ncia &agrave;s fluoroquinolonas (89,2%) e aos carbapenemos (90,0%). Nos &uacute;ltimos anos, verificou-se o aparecimento de um clone epid&eacute;mico de <i>A. baumannii</i> em Portugal, o &laquo;sequence type 118&raquo; (ST 118), que produz carbapenemases do tipo oxacilinases &ndash; 23 (OXA-23), tendo-se disseminado por v&aacute;rios hospitais e estando a substituir os clones, at&eacute; ent&atilde;o, mais frequentes em Portugal; o &laquo;sequence type 92&raquo; (ST 92), produtor de carbapenemases do tipo OXA-23 e o &laquo;sequence type 98&raquo; (ST 98), produtor de carbapenemases do tipo oxacilinases &ndash; 24 (OXA-24)<sup>52,53</sup>.</p>     <p>&nbsp;</p>     <p><b>Conclus&otilde;es</b></p>     ]]></body>
<body><![CDATA[<p>A resist&ecirc;ncia bacteriana aos antibi&oacute;ticos &eacute; um dos problemas de sa&uacute;de p&uacute;blica mais graves atualmente, estando associada ao uso inadequado de antibi&oacute;ticos. Portugal &eacute;, no contexto europeu, um pa&iacute;s com um consumo de antibi&oacute;ticos elevado, apesar de se verificar uma diminui&ccedil;&atilde;o em anos recentes, pelo que &eacute; importante tomar medidas no sentido de reduzir o consumo destes medicamentos. Em Portugal, verificou-se um aumento da resist&ecirc;ncia aos antibi&oacute;ticos nas bact&eacute;rias <i>S. aureus</i>, <i>K. pneumoniae</i> e <i>A. baumannii</i>, enquanto as bact&eacute;rias do g&eacute;nero <i>Enterococcus</i> apresentam uma diminui&ccedil;&atilde;o da resist&ecirc;ncia. &Eacute;, assim, necess&aacute;rio adotar estrat&eacute;gias que minimizem a resist&ecirc;ncia nas esp&eacute;cies em que esta apresenta um n&iacute;vel elevado, ou em que houve um aumento da resist&ecirc;ncia em anos recentes, tais como o uso adequado de antibi&oacute;ticos no tratamento de infe&ccedil;&otilde;es causadas por essas esp&eacute;cies<sup>13</sup> e um melhor controlo de infe&ccedil;&otilde;es hospitalares<sup>13,54</sup>. Os dados publicados sobre resist&ecirc;ncias bacterianas s&atilde;o dados recolhidos exclusivamente em meio hospitalar, n&atilde;o tendo sido encontrados dados de resist&ecirc;ncias recolhidos em cuidados prim&aacute;rios. Apesar de considerarmos que as infe&ccedil;&otilde;es causadas por estirpes resistentes em meio ambulat&oacute;rio s&atilde;o, n&atilde;o raras vezes, tratadas em meio hospitalar, parece-nos ser fundamental a recolha de dados de resist&ecirc;ncia bacteriana nos cuidados prim&aacute;rios. Desse modo, poderia ser elaborado um mapa microbiol&oacute;gico das resist&ecirc;ncias em ambulat&oacute;rio a ser, subsequentemente, divulgado pelos profissionais de sa&uacute;de e popula&ccedil;&atilde;o. Al&eacute;m disso, a promo&ccedil;&atilde;o da comunica&ccedil;&atilde;o e do fluxo de informa&ccedil;&atilde;o entre os cuidados prim&aacute;rios e os cuidados diferenciados poder&aacute; melhorar as medidas de combate ao problema de sa&uacute;de p&uacute;blica que as resist&ecirc;ncias bacterianas representam.</p>     <p>Uma outra medida a tomar, com vista a prevenir a emerg&ecirc;ncia e dissemina&ccedil;&atilde;o das resist&ecirc;ncias bacterianas, &eacute; restringir o consumo de antibi&oacute;ticos na pr&aacute;tica veterin&aacute;ria e na produ&ccedil;&atilde;o animal, atividades respons&aacute;veis pelo consumo inadequado de muitos antibi&oacute;ticos e pela sele&ccedil;&atilde;o de estirpes resistentes que depois se transmitem para outros animais e para os humanos.</p>     <p>&nbsp;</p>     <p><b>Refer&ecirc;ncias Bibliografia</b></p>     <p>1. World Health Organization. Containing antimicrobial resistance. Geneva, Switzerland: WHO; 2005. 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<body><![CDATA[<!-- ref --><p>53. Manageiro V., Jones-Dias D., Ferreira E., Louro D., Canica M. Genetic diversity and clonal evolution of carbapenem-resistant Acinetobacter baumannii isolates from Portugal and the dissemination of ST118. Int J Antimicrob Agents. 2012;40:398-403.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=803808&pid=S0870-9025201600010001100045&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>54. Bisson G., Fishman N.O., Patel J.B., Edelstein P.H., Lautenbach E. Extended-spectrum beta-lactamase-producing Escherichia coli and Klebsiella species: Risk factors for colonization and impact of antimicrobial formulary interventions on colonization prevalence. Infect Control Hosp Epidemiol. 2002;23:254-60.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=803810&pid=S0870-9025201600010001100046&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <p>&nbsp;</p>     <p><b>Financiamento</b></p>     <p>Projeto financiado pela Fundac&atilde;o para a Ci&ecirc;ncia e Tecnologia (FCT) (PTDC/SAU-ESA/105530/2008), Minist&eacute;rio da Educac&atilde;o e Ci&ecirc;ncia e co-financiado pelo FEDER atrav&eacute;s do POFC-COMPETE. iB.</p>     <p>&nbsp;</p>     <p><b>Agradecimentos</b></p>     <p>Os autores agradecem ao iBiMED (UID/BIM/04501/2013).</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><i><a href="#topc0">*</a><a name="c0"></a>Autor para correspondência:</i> Correio eletrónico: <a href="mailto:ruijoao@ua.pt">ruijoao@ua.pt</a></P>      ]]></body><back>
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