DETECTION OF LISTERELLA INFECTION IN WILD RODENTS, INSECTIVORA AND IXODES TICKS
ARMY BIOLOGICAL LABS FREDERICK MD
Pagination or Media Count:
Listerellosis was discovered in a natural state in field mice Microtus arvalis Pall. - 8 finds, in a water rat Arvicola terrestris L. - one find, in a water shrew Neomys fodiens Schrb. - one find, and in a common shrew Sorex araneus L. - one find. One strain of L monocytogenes was isolated from pubescent ticks, Dermacentor pictus Herm., taken from healthy cows. All of the isolated strains, by morphological, cultural, tinctorial, biochemical and antigenic properties, were completely similar to each other and fully corresponded to Listeria monocytogenes Mur., Wb et Sw.. The strains possessed an express pathogenicity for field mice, white mice and rabbits. For the first two types of animals the minimum lethal dose in a subcutaneous infection amounted to 10-100 thousand microbic cell. The established phenomenon of natural incidence of listerellosis in rodents and insectivora, which are widely spread in nature, and also in ticks, increases the knowledge concerning the epizootology and epidemiology of this little investigated disease.
- Medicine and Medical Research