Isolamento de Escherichia coli O 157: H7 e contagem de micro-organismos indicadores em leite cru obtidos por ordenha não mecanizada e mecanizada de propriedades da região do Recôncavo Baiano

Abstract

This work aimed to evaluate the hygienic- sanitary parameters in twenty- six properties Recôncavo Baiano through questionnaires, determining the count of micro -organisms indicators and isolation of Escherichia coli O 157 : H7 in samples of fresh milk obtained by milking non- mechanized and mechanized. The aerobic mesophilic count in milk obtained by non-mechanized mechanized milking were higher. As the count of filamentous fungi and yeast results suggest that hygiene is unsatisfactory during the milking process in all the evaluated properties. Regarding the MPN of coliforms in milk, mechanized system with properties inferior to the non- mechanized milking values , demonstrating best sanitary conditions during milking and storage, although the law prescribes standards for these microorganisms. The results of E. coli were higher in milk obtained by mechanized milking. There was no significant relationship with the number S.aureus and psychotropic bacteria in any of milking systems data. Have Escherichia coli O 157: H7 positive sample was found in a dairy property after specific biochemical tests have been conducted for this species. Regarding hygiene and sanitary parameters 90 % of eighteen properties that performed non-mechanized milking had failures in hygiene and cleaning procedures for milking. Regarding the eight properties that perform mechanized milking , only one had flaws in hygiene procedures.