Epidemiology and Infection



Potential microbiological contamination of effluents in poultry and swine abattoirs


L. S. S. BARROS a1c1, L. A. AMARAL a1, C. S. LORENZON a1, J. L. JUNIOR a2 and J. G. MACHADO NETO a3
a1 Department of Preventive Veterinary Medicine and Animal Reproduction of FCAV/UNESP/Campus Jaboticabal, Jaboticabal, São Paulo, Brazil
a2 Department of Rural Engineering of FCAV/UNESP/Campus Jaboticabal, Jaboticabal, São Paulo, Brazil
a3 Department of Phytosanitation of FCAV/UNESP/Campus Jaboticabal, Jaboticabal, São Paulo, Brazil

Article author query
barros ls   [PubMed][Google Scholar] 
amaral la   [PubMed][Google Scholar] 
lorenzon cs   [PubMed][Google Scholar] 
junior jl   [PubMed][Google Scholar] 
neto jg   [PubMed][Google Scholar] 

Abstract

Health risks in the effluents of seven swine abattoirs and of seven poultry abattoirs were evaluated with regard to environment degradation and to dissemination of pathogenic microorganisms during the rainy and dry seasons. Supply-water samples from affluents and effluents of the treatment systems at different sites within the abattoir processing system were analysed. Similarly, water samples from the three recipient sites (emission point, 100 m upstream, 100 m downstream) were also analysed. Temperature, free residual chlorine (FRC), total coliform bacteria, Escherichia coli, enterococci, identification and serotyping of salmonellae were assessed. Scalding is the most significant stage in the slaughtering chain (P<0·05) when temperature is taken into account. Temperatures at effluents and at the sampled sites in the water bodies accorded to state and federal legislation standards. Supply waters did not meet the standards for FRC and microbial count standards according to the Ministry of Health and within limits imposed by the Industrial and Sanitary Inspection Regulations for Animal Products. Feather plucking and evisceration in poultry slaughter and the cleansing of carcasses and facilities in poultry and swine slaughtering had the highest contamination impact. The three loci at the water bodies were above the microbiological standards for classes II and III sites, in conformity with Law 8468 of the state of São Paulo, Brazil and Conama. Salmonella was found at several sites during slaughter, at both types of abattoirs, including in the effluent treatment system. This showed that these sites were the dissemination sources of the microorganism.

(Accepted May 17 2006)
(Published Online August 8 2006)


Correspondence:
c1 Department of Preventive Veterinary Medicine and Animal Reproduction of FCAV/UNESP/Campus Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane, km 05, 14.884.900, Jaboticabal, São Paulo, Brasil. (Email: ldy192020@yahoo.com.br or deora@zipmail.com.br)


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