Evaluation of the susceptibility of Prototheca zopfii to milk pasteurization |
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Authors: | Melville Priscilla A Watanabe Eliana T Benites Nilson R Ribeiro Andréa R Silva Jocelina AB Garino Felício Costa Elizabeth O |
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Institution: | 1.Núcleo de Apoio à Pesquisa em Glandula Mamária e Produ??o Leiteira (NAPGAMA), Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de S?o Paulo, Brazil ; |
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Abstract: | Protothecosis has been reported in humans (gastroenteritis, bursitis, etc.) and in many other animal species. Bovine mastitis
represents the main form of occurrence of protothecosis in cattle. Milk as well as dairy products, when contaminated with
Prototheca spp., represent a potential means of transmission of this zoonosis. The purpose of this study was to evaluate the susceptibility
of forty Prototheca zopfii strains isolated from milk from intramammary infections in dairy cows and also from bulk milk tanks of dairy farms, to the
different ratios of temperature/time employed in the thermal treatment of milk: 72–75 °C/1 5 seconds, 72–75 °C/20 seconds
and 62–65 °C/30 minutes. The samples were subjected to these different temperature/time ratios. The evaluation of the thermal
susceptibility of the P. zopfii strains showed that 34 strains were resistant in at least one of the tests. The results point out the need to consider the
importance of mastitis caused by Prototheca spp. asrepresenting a public health risk.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | bovine mastitis milk pasteurization Prototheca zopfii |
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