Listeriosis en bovinos de la Provincia de Buenos Aires, Argentina

Abstract

<p>Se reali­zó un estudio retrospectivo de casos de listeriosis bovina ocurridos en diferentes partidos de Provincia de Buenos Aires (Argentina). Se utilizaron las técnicas diagnósticas de histopato­logía, bacteriología e inmunohistoquímica. De 17 casos confirmados por esta última técnica, en 7 de ellos se dispuso de material para el cultivo bacteriológico y solo en 3 casos se pudo aislar <em>Listeria monocytogenes. </em>El 64,7% de los casos de listeriosis se presentaron en rodeos que consumían ensilado de maíz. La enfermedad se diagnosticó con mayor frecuencia en sistemas de producción intensivos (feedlot y tambos). Cuatro casos negativos al cultivo de <em>L. monocytogenes </em>se lograron confirmar por inmunohistoquímica, por lo cual esta técnica se revela valiosa dado que su empleo mejora la eficiencia diagnóstica de los casos de listeriosis bovina.</p>

Nervous form of listeriosis in buffaloes

“…However, only one of the animals tested positive by IHC. This finding differs from those reported in other studies conducted with cattle and small ruminants (Rissi et al 2006, Oevermann et al 2010, Margineda et al 2012, which showed positive results by IHC in all of the animals analyzed. Nevertheless, differences in IHC staining have been observed in cases of listeriosis in goats, ranging from strong to absent, depending on the time of lesion evolution (Rissi et al 2006).…”

“…In the present study, the disease affected calves aged <40 days. The main clinical signs observed by the veterinarian were ataxia, limb paralysis, lateral recumbency, and death, similar to those described for cattle (Margineda et al 2012) and small ruminants (Rissi et al 2006(Rissi et al , 2010. Morbidity (6.38%) and lethality (100%) were also similar to those described for these species.…”

“…The most significant lesions occurred in the brainstem, and were found unilaterally and characterized mainly by microabscesses, areas of malacia, and perivascular cuffs, similar to what has been observed in cattle (Sanches et al 2000, Oevermann et al , Margineda et al 2012, goats (Rissi et al 2006, Headley et al 2013, and sheep (Rissi et al 2010, Headley et al 2013.…”

“…Oevermann et al (2010) observed that the microabscesses show a larger number of macrophages in cattle than in small ruminants, and that occurrence of giant multinucleated cells, as observed in the present study, is significantly higher in cattle compared with sheep and goats. Perivascular cuffs were composed predominantly of mononuclear cells with rare polymorphonuclear cells, and extended from the brainstem to the cerebral cortex and spinal cord, findings also observed in cattle (Galiza et al 2010, Margineda et al 2012 and small ruminants (Campero et al 2002, Headley et al 2013.…”

Identification and characterization of Listeria monocytogenes and Listeria innocua in bovine listeriosis cases in Uruguay

“…in Uruguay is rare. A similar situation might occur in the region, because in Argentina there are few reports (Margineda et al, 2012;Alvarez et al, 2018), while in Brazil no similar situation has been described.…”