Listeria spp. in food of animal origin

Laciar, A.L.; Vaca, L.; de Centorbi, O.N.

Revista Argentina de Microbiologia 31(1): 25-30

1999


ISSN/ISBN: 0325-7541
PMID: 10327457
Document Number: 504560
Food samples of animal origin were analysed for Listeria spp. Strains were characterized using biochemical and serological tests. The rapid enrichment method using Palcam and Oxford agars enabled the 7 strains to be grown. Five L. innocua strains, 1 L. monocytogenes and 1 L. welshimeri strain were isolated from 208 samples of raw milk from farms. L. monocytogenes was isolated from milk of 1 cow with subclinical mastitis. No Listeria strains were isolated from pasteurized milk, chocolate milk or cheese, but 1 L. welshimeri strain was detected in ice cream. L. ivanovii was detected in 2.5% of meat product samples. Results are discussed with reference to sources of contamination in Argentina and the prevention of listeriosis.

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