Abstract

LOPEZ-HERNANDEZ, Karla María et al. Microbiological risk assessment associated to raw oyster consumption contaminated with Vibrio cholerae and Vibrio parahaemolyticus. Biotecnia [online]. 2023, vol.25, n.1, pp.14-23.  Epub Aug 07, 2023. ISSN 1665-1456.  https://doi.org/10.18633/biotecnia.v25i1.1701.

The aim of the study was to assess the potential risk of exposure to V. cholerae and V. parahaemolyticus associated to raw American oyster (Crassostrea virginica) consumption collected from the Mandinga Lagoon System (MLS), in restaurants, oyster bars, and street vendors. Risk was estimated as number of cases/100,000 servings with FDA model. The risk of oyster consumption from MLS contaminated with V. cholerae noO1/noO139 chxA+ and unrefrigerated 10-h was low (99 × 10-5 cases) in summer; V. parahaemolyticus tdh+ y tdh+/trh+ estimated risk was high in spring (2,200 × 10-5 y 4,000 × 10-5 cases, respectively) and the pandemic strain orf8+ risk was medium in winter (110 × 10-5 cases). Oyster cocktail consumption unrefrigerated for 10 h and contaminated with V. cholerae noO1/noO139 chxA+, represented a low mean risk (0.87 × 10-5 and 0.44 × 10-5 cases) for oyster cocktails from restaurants and oyster bars, respectively, a high mean risk for street vendor cocktails stored at ambient temperature 24-h (2,500 × 10-5 cases), and a low mean risk for V. parahaemolyticus tdh+ in restaurants (0.21 × 10-5 cases) and oyster bar (1.1 x 10-5 cases) cocktails. Risk assessment results indicated that pathogenic percentage, type of establishment, and unrefrigerated storage time were variables that most increased the probability of illness, and spring the season with the highest risk for consumers.

Keywords : Human consumption; Crassostrea virginica; health risk; cholera; pathogenic bacteria.

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