Occurrence of potentially pathogenic Vibrio in oysters (Crassostrea gigas) and waters from bivalve mollusk cultivations in the South Bay of Santa Catarina

Abstract

Introduction:This research aimed to identify and quantify potentially pathogenic Vibrio from different cultivations of bivalve shellfi sh in the State of Santa Catarina, Brazil, and water regions in the South Bay, as well as correlate the incidence of these microorganisms with the physicochemical parameters of marine waters. Methods: Between October 2008 and March 2009, 60 oyster and seawater samples were collected from six regions of bivalve mollusk cultivation, and these samples were submitted for Vibrio counts. Results: Twenty-nine (48.3%) oyster samples were revealed to be contaminated with one or more Vibrio species. The Vibrio parahaemolyticus and Vibrio vulnifi cus counts in the samples ranged from < 0.5 log 10 Most Probable Number (MPN) g -1 to 2.3 log 10 MPN g -1 oyster and from < 0.5 log 10 MPN g -1 to 2.1 log 10 MPN g -1 oyster, respectively. Of the 60 seawater samples analyzed, 44 (73.3%) showed signs of contamination with one or more vibrio species. The counts of V. parahaemolyticus and V. vulnifi cus in the samples ranged from < 0.3 log 10 MPN·100mL -1 to 1.7 log 10 MPN·100mL -1 seawater and from < 0.3 log 10 MPN·100mL -1 to 2.0 log 10 MPN·100mL -1 seawater, respectively. A positive correlation between V. vulnifi cus counts and the seawater temperature as well as a negative correlation between the V. parahaemolyticus counts and salinity were observed. Conclusions:The results suggest the need to implement strategies to prevent vibrio diseases from being transmitted by the consumption of contaminated bivalve shellfi sh.

Long-Term Study of Vibrio parahaemolyticus Prevalence and Distribution in New Zealand Shellfish

“…Some studies have shown a linear relationship, similar to that of SST, when testing water samples (25,28,31,33). However, the data from our study did not show a particular correlation between salinity and V. parahaemolyticus in oyster samples, and these are results that are similar to those from some other studies (8,27,30,31,37). This could be related to the narrow range of salinity in our shellfish-growing areas.…”

Contamination of semiarid potiguar reservoirs by harmful bacteria

“…Esse gênero também foi identificado por outros pesquisadores em diversos ambientes aquáticos no Brasil (Costa et al, 2008;Rebouças et al, 2011;Ramos et al, 2014). Na Baía do Sul, perto da Ilha de Santa Catarina, no Sul do Brasil, as espécies patogênicas de víbrio mais frequentes foram V. parahaemolyticus e V. vulnificus.…”

“…Na Baía do Sul, perto da Ilha de Santa Catarina, no Sul do Brasil, as espécies patogênicas de víbrio mais frequentes foram V. parahaemolyticus e V. vulnificus. Segundo os autores da pesquisa, houve uma correlação direta entre a temperatura elevada da água e o isolamento de V. vulnificus nesse ambiente (Ramos et al, 2014). Segundo Rebouças et al (2011), num trabalho realizado com água de cultivo de camarão no Ceará, o grande risco do isolamento de espécies de Vibrio está no fato desse gênero poder ser um reservatório para genes de patogenicidade, inclusive de resistência às drogas antimicrobianas, e nesse trabalho os autores perceberam que o padrão de resistência a essas drogas não estava relacionado a uma espécie apenas, mas ao gênero como um todo.…”

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“…Esse gênero também foi identificado por outros pesquisadores em diversos ambientes aquáticos no Brasil Rebouças et al, 2011;Ramos et al, 2014). Na Baía do Sul, perto da Ilha de Santa Catarina, no Sul do Brasil, as espécies patogênicas de víbrio mais frequentes foram V. parahaemolyticus e V. vulnificus.…”