UV Influence on Yersinia enterocolitica strains

Investigations were focused on the UV effect on different strains of Yersinia enterocolitica. The experiment was performed either on various bacteriological media inseminated with Y. enterocolitica germs or on food of animal origin contaminated experimentally. Our investigations showed that using a normal bacteriological lamp the Y. enterocolitica species may be destroyed over maximum 115 minutes until a 10 cm deep in product. The studies of Yersinia enterocolitica tolerance to UV radiation have been performed with a view to offer technologists from the food industry the most practical and efficient way for decontamination and sterilization of installations, work tables and surfaces, likely to be contaminated with this bacterial species. The resistance of Y. enterocolitica to UV radiation is reduced in 75 minutes of action but in two situations it has been observed that the value of 10 CFU/ ml remained; in both of the cases the remanence was achieved on a liquid column (in tubes) because the UV radiation penetrates with more difficulty. In the samples that were contaminated by means of the experiment, the Yersinia strains were quickly neutralized even if the exposure is done in a thick layer. No matter the nutritive substrate in which the grown took place (contaminated samples or bacterial medium) the wrack of Yersinia strains by exposure on UV rays is ditto efficaciously (highly effective). Irrespective of the substrate thickness in which the exposure was performed (from 1 cm to 10 cm) the action of UV rays is ditto efficaciously (highly effective).