Evaluation of phenotypic markers associated with pathogenicity in the genus Listeria
Nunes Z das, G.; Hofer, E.
Revista do Instituto de Medicina Tropical de Sao Paulo 36(4): 293-299
1994
ISSN/ISBN: 0036-4665 PMID: 7732259 Document Number: 427236
A total of 130 Listeria strains were tested in order to evaluate lecithinase production and capacity for Congo red adsorption as markers of pathogenicity. The strains were identified according to acid production from sugars and by the CAMP test and the data were correlated with the ability to produce keratoconjunctivitis in guinea pigs. L. monocytogenes cultures presented 51.8% and 88.8% positivity rates for Congo red adsorption and lecithinase production, respectively, whereas 80.8% and 100% for L. innocua cultures were negative for the two test, respectively.