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Evaluation of pathogenicity of Paenibacillus alvei culture obtained from a dead bee brood from Berezinsky Biosphere Nature Reserve was realized in the conditions of the Republic of Belarus by an example of 30-day old white male mice with body weight of 16-18 grams. Experimental animals were infected with European foul brood (Paenibacillus alvei) intraperitoneally. Research results showed that bacteria Paenibacillus alvei after the intraperitoneal infection with various amount of microbial cells did not cause mouse death; i.e. it was not pathogenic for white mice. In course of the realized observations over the laboratory mice after introduction of infection there were stated no changes in mice behavior and overall condition. There were no visible pathologicoanatomic changes in internal organs. After the bacteriologic examination of internal organs and blood there were isolated pure cultures of Paenibacillus alvei

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