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A análise fenotípica de 246 amostras do gênero Listeria isolados de animais portadores e doentes, provenientes de três regiões do país, colecionadas no período de 1971 a 2000, permitiu caracterizar as espécies e sorovares prevalentes. Dentre os animais predominaram os espécimes fecais de bovinos normais (217 amostras, 88,2%), em contraposição aos 29 isolados (11,7%) de Listeria de animais doentes, apresentando comprometimento do sistema nervoso central (15 amostras, 6,0%) e outras localizações sistêmicas (14 amostras, 5,6%). Quanto às espécies e sorovares, predominaram L. innocua 6a e não tipável (140 amsotras, 56,9%) e L.monocytogenes 4a (37 amostras, 15,0) e 4b (22 amostras, 8,9%) principalmente nas fezes de bovinos hígidos e nos animais doentes, L. monocytogenes sorovares 4b (14 amostras, 5,6%) com destaque nos ruminantes e 1a (8 amostras, 3,2%) incidindo nas outras espécies animais (roedores e canídeos) e tendo localizações prevalentes em áreas distintas ao sistema nervoso central. Two hundred fourty-six strains of the genus Listeria were isolated from sick and clinically healthy animals, collected in three different regions of Brazil during 1971-2000. About 88.2% (217 cultures) yielded Listeria species from faecal specimens of healthy cattle and 29 strains (11.7%) were isolated from sick animals: 15 (6.0%) from central nervous system (CNS) and 14(5.6%) were from otherwise sterile sites. Phenotyping techniques were used to characterize the Listeria isolates. The commonest were L. innocua 6a and non-typable (140/56.9%), L. monocytogenes 4a (37/15.0%) and 4b (22/8.9%), originated mainly from stools of healthy cattle. From sick animals the predominant species and serovars were L. monocytogenes 4b (14/5.6%), and the higher incidence was observed in ruminants (12/4.8%) and 8/3.2% of the serovar 1a from other animal species (rodents and canines) mainly isolated from CNS samples

Espécies e sorovares de Listeria isolados de animais doentes e portadores no Brasil