ÿþ<HTML><HEAD><TITLE>25º Congresso Brasileiro de Microbiologia </TITLE><link rel=STYLESHEET type=text/css href=css.css></HEAD><BODY aLink=#ff0000 bgColor=#FFFFFF leftMargin=0 link=#000000 text=#000000 topMargin=0 vLink=#000000 marginheight=0 marginwidth=0><table align=center width=700 cellpadding=0 cellspacing=0><tr><td align=left bgcolor=#cccccc valign=top width=550><font face=arial size=2><strong><font face=Verdana, Arial, Helvetica, sans-serif size=3><font size=1>25º Congresso Brasileiro de Microbiologia </font></font></strong><font face=Verdana size=1><b><br></b></font><font face=Verdana, Arial,Helvetica, sans-serif size=1><strong> </strong></font></font></td><td align=right bgcolor=#cccccc valign=top width=150><font face=arial size=2><strong><font face=Verdana, Arial, Helvetica, sans-serif size=1><font size=1>ResumoID:1707-1</font></em></font></strong></font></td></tr><tr><td colspan=2><br><br><table align=center width=700><tr><td>Área: <b>Microbiologia Clinica ( Divisão A )</b><p align=justify><strong> <P CLASS="MSONORMAL" STYLE="TEXT-ALIGN: CENTER;" ALIGN="CENTER"><SPAN STYLE="">BACTERIAL RESISTANCE TO ANTIBIOTICS IN AQUATIC ENVIRONMENTS OF RIO DE JANEIRO.<O:P></O:P></SPAN></P> </strong></p><p align=justify><b><u>Felipe Hernandes Coutinho </u></b> (<i>UFRJ</i>); <b>Ricardo Pilz Vieira </b> (<i>UFRJ</i>); <b>Cynthia Barbosa Silveira </b> (<i>UFRJ</i>); <b>Vivian Alves Monteiro </b> (<i>UFRJ</i>); <b>Rodolpho Mattos Albano </b> (<i>UERJ</i>); <b>Orlando Bonifácio Martins </b> (<i>UFRJ</i>)<br><br></p><b><font size=2>Resumo</font></b><p align=justify class=tres><font size=2><div style="text-align: justify;"><font size="3"><em><span style="font-size: 12pt; font-family: Verdana; font-style: normal;" lang="EN-US">Bacterial resistance to antibiotics is a public health issue, occurring due to the incorrect use of these substances by patients, thus contributing to the emergence of increasingly resistant strains. Recently, it has been reported that some soil bacterial strains are resistant to several antibiotics of clinical use both at clinical concentrations and at fifty-fold higher concentrations. Some of these organisms are also capable of using several of these compounds as their sole carbon source. In the present work, Bacteria from Guanabara bay water, a region that receives medical and domestic waste, were isolated in media containing ampicillin, tetracycline or kanamycin. Three species were identified by DNA sequencing: </span><span style="font-size: 12pt; font-family: Verdana;" lang="EN-US">Aeromonas sp., Acinetobacer sp. </span></em><em><span style="font-size: 12pt; font-family: Verdana; font-style: normal;" lang="EN-US">and a</span><span style="font-size: 12pt; font-family: Verdana;" lang="EN-US"> Klebsiella pneumoniae</span></em><em><span style="font-size: 12pt; font-family: Verdana; font-style: normal;" lang="EN-US"> containing plasmidial DNA which confers ampicillin resistance, as demonstrated by transfecting this plasmid to originally non-resistant </span><span style="font-size: 12pt; font-family: Verdana;" lang="EN-US">E.coli</span></em><em><span style="font-size: 12pt; font-family: Verdana; font-style: normal;" lang="EN-US">. Following this, construction of 16S rRNA libraries was performed for a metagenomic analysis of resistant bacteria to increasing ampicillin concentrations (20 mg/L; 1g/L and 12g/L), in three aquatic environments of Rio de Janeiro s coastal region with distinct input of sewer waste ( Barra da Tijuca, the less impacted, Guanabara bay and Maré Cannal, the most impacted), bacterial growth was observed in all concentrations. This work allows the comprehension of the diversity of resistant and super-resistant organisms to ampicillin, an antibiotic largely used in medical, veterinarial and laboratory practices, and the profiles of resistance to tetracycline and kanamycin in the aquatic environment. Moreover, it helps to understand the pattern of dispersion of antibiotic resistance genes which may happen largely by horizontal gene transfer between aquatic Bacteria, including pathogenic strains.</span></em></font></div> </font></p><br><b>Palavras-chave: </b>&nbsp;Antibióticos, Aquático, Bactéria, Metagenômica, Resistência</td></tr></table></tr></td></table></body></html>