Avaliação microbiológica, detecção e susceptibilidade a antimicrobianos de potenciais enteropatógenos das famílias Enterobacteriaceae e Vibrionaceae em mexilhões Perna perna da praia de Itaipu, Niterói-RJ

• Autor(a) principal: Jayme, Marcelly Miranda Aybal
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14421
• topic: Mussels; PCR; Escherichia coli; Salmonella spp; Vibrio spp; Antimicrobials; Mexilhão; PCR; Salmonella spp; Vibrio spp; Antimicrobianos; Mexilhão; Perna (Organismo) Parasitologia; Reação em cadeia de polimerase; Escherichia coli; Salmonella; Vibrio cholerae Patogenicidade; Microbiologia de Alimentos; Agentes antiinfecciosos; CNPQ::CIENCIAS BIOLOGICAS::MICROBIOLOGIA::MICROBIOLOGIA APLICADA::MICROBIOLOGIA MEDICA

Mussels (Perna perna) feed by filtering large quantities of water, enabling the retention of environmental bacteria and virus in their bodies. For this reason bacterial foodborne intoxications associated with these bivalves are common therefore mussels used for human consumption have to come from coastal areas where the microbiological quality of the water complies with current legislation laid down by the Conselho Nacional do Meio Ambiente. Following harvest these mussels go through a process of washing, boiling, packing and then transported to the fish markets for retail. During these processes and techniques normally no food hygiene plan is followed which may enable microorganisms growth and cross-contamination. The aim of this study was to determine the microbiological quality of Perna perna growing in Itaipu beach, Niterói, RJ from direct harvest (boiled and raw) and retailed at the São Pedro fish market. By using the MPN test it was possible to determine the total and faecal coliforms and by conventional and molecular techniques it was detected and identified the Escherichia coli, Salmonella spp. and Vibrio spp. present in the samples. The antimicrobial susceptibility test was also performed to determine the antimicrobial resistance profile of the isolated strains. From all the samples studied (27) only 7 samples had results complying with the legislation, 3 which suffered boiling process in the laboratory, 3 raw samples and 1 samples from the fish market. There were no significant differences between samples regarding the faecal coliforms count, however there was significant differences between samples collected in different seasons (dry and rainy). From all the nine water samples collected only one demonstrated to be proper for the production and harvest of mussels (lower than 14 CF/mL). There were 77 E. coli strains who were isolated and physiologically characterized and those results confirmed by PCR the sorotypo EPEC, STEC and EAEC; 4 strains of Salmonella spp. only one confirmed by PCR; and from the 57 strains identified as Vibrio spp., 51 were confirmed by PCR, where 46 were Vibrio spp., 2 V. cholerae, 1 V. vulnificus, 1 V. parahaemolyticus and 1 V. mimicus. From all the E. coli strains 13% were multi-resistant and 15.6% showed multiple resistance. All the Salmonella spp. strains demonstrated sensitivity to all tested antimicrobials. In the Vibrio spp. strains 68.6% were multi-resistant and 72.5% had multiple resistance Targeted genes were all possible to detect directly from the analysis of the enrichment broth with the exception for Salmonella and V. cholera genes. The present study provided results that demonstrate the poor microbiological quality of the mussels retailed in Itaipú borough which can represent a public health risk for all local and tourist population. These outcome brings to light how inspections in all food chain of the product are paramount for public health.