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Persistence of Salmonellae in Poultry Excreta¹

ABSTRACT

Land application of animal residues containing large numbers of viable pathogenic microorganisms is not an acceptable practice. Information is needed upon which to base storage guidelines to ensure extensive pathogen dieoff. Salmonellae inoculated into samples of poultry excreta declined to very low numbers or disappeared within a month, as judged by a specific most-probable-number procedure. The decline was usually preceded by a period of growth, however. Overall reductions of 99% were achieved, on the average, in 19 days when incubation was at 9 to 12C, in 11 days at 18 to 20C, and in 3 days at 30C. Although drying excreta at room temperature killed 99.5% of the inoculated cells, survivors persisted for relatively long periods of time. Storage of undried excreta is an effective means of killing salmonellae.

Key Words: waste management

¹ Contribution from the Department of Environmental Science, Cook College, Rutgers—The State University of New Jersey, New Brunswick, N. J. 08903. Supported in part by the Public Health Service Grant UI-00528 from the National Center for Urban and Industrial Health, Consumer Protection and Environmental Health Service. H. E. Besley, Project Director.

² Instructor, Department of Environmental Science, Rutgers University; Physical Scientist, U. S. Environmental Protection Agency, Region II; and Professor, Department of Environmental Science, Rutgers University, respectively.

Received for publication July 3, 1973.