Abstract

MORAES, Ivany R de; DEL MASTRO, Nélida L; JAKABI, Miyoko  and  GELLI, Dilma S. Radiosensibility of Vibrio cholerae o1 incorporated in oysters, to ⁶⁰CO. Rev. Saúde Pública [online]. 2000, vol.34, n.1, pp. 29-32. ISSN 0034-8910.  http://dx.doi.org/10.1590/S0034-89102000000100006.

OBJECTIVE: Evaluate the effect of ionizing irradiation by ⁶⁰Co on Vibrio cholerae O1, El-Tor, Ogawa, non-toxigenic, incorporated in live oysters Crassostrea brasiliana. METHODS: Samples of oysters were selected from Cananéia town in the South coast of S. Paulo state, Brazil, contaminated with Vibrio cholerae and irradiated with ⁶⁰Co at 0.5 and 1.0 kGy dosages. RESULTS: Showed significant reductions of the initial number of V. cholerae , ranging from 3.4 x10⁷ to 10³ and 10², respectively. The D₁₀ values related with the respective doses of irradiation were 0.173 and 0.235. CONCLUSION: Considering a 6 value as safety factor, it is concluded that 1.41 kGy irradiation dosage is necessary to eliminate a high number of V. cholerae viable cells in oysters. Controls were used in the experiment.

Keywords : Oysters [microbiology]; Vibrio cholerae [radiation effects]; Radiation tolerance.