Listeria monocytogenes ATCC 35152 and NCTC 7973 contain a nonhemolytic, nonvirulent variant

L Pine, R E Weaver, G M Carlone, P A Pienta, J Rocourt, W Goebel, S Kathariou, W F Bibb, G B Malcolm
1987 Journal of Clinical Microbiology  
Listeria monocytogenes NCTC 7973 and this same strain deposited as ATCC 35152 contain two phenotypes: hemolytic virulent colonies and nonvirulent colonies that show no zones of hemolysis when streaked on heart infusion agar containing 5% rabbit blood. Results of examinations of these virulent and nonvirulent strains by investigators at the Centers for Disease Control, Atlanta, Ga., the Pasteur Institute, Paris, France, and the University of Wurzburg, Federal Republic of Germany, support the
more » ... ny, support the conclusion that the avirulent strain is a nonhemolytic mutant of the virulent strain and that hçmolysin is a virulence factor for L. monocytogenes. on May 8, 2020 by guest http://jcm.asm.org/ Downloaded from
doi:10.1128/jcm.25.11.2247-2251.1987 fatcat:l7b6ffp6ljbdhm4knhrenzecwe