Affiliation:
1. Department of Microbiology, School of Science, Oregon State University, Corvallis, Oregon
Abstract
When 15 bacterial species representing genera associated with food-borne diseases were irradiated individually, all except
Escherichia coli
and
Streptococcus faecalis
showed typical linear dose-survival curves in Hartsell's broth. The minimal lethal dose (MLD) for the organisms tested ranged from 3.0 × 10
5
to 6.0 × 10
5
rad.
Salmonella paratyphi
B,
S. wichita, S. typhi, E. coli
, and
S. faecalis
were found to be the least sensitive to radiation. In commercially canned crabmeat the survival curves of
S. typhi, S. paratyphi
B, and
S. wichita
exhibited to varying degrees an initial linear death decline with increasing radiation doses, followed by a distinct tailing effect caused by survival of low numbers at the higher doses. The above species of
Salmonella
were further individually subjected to γ-radiation in various dilutions of crabmeat. The “tailing effect” gradually disappeared, with the dose-survival curve tending to become linear as the concentration of the crabmeat decreased.
Publisher
American Society for Microbiology
Subject
General Pharmacology, Toxicology and Pharmaceutics,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine
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