Surto de ceratoconjuntivite infecciosa bovina e hemoncose causando mortalidade em bezerros

Abstract

É descrito um surto de ceratoconjuntivite infecciosa bovina (CIB) e hemoncose intercorrente afetando um grupo de 116 bezerros de 1-2 anos de idade na região central do Rio Grande do Sul. Vinte bezerros foram afetados e nove morreram. Os sinais clínicos incluíam perda de peso, marcada palidez da mucosa oral, lacrimejamento, opacidade focal da córnea e avermelhamento da conjuntiva. Sinais mais avançados incluíam lacrimejamento copioso, opacidade da córnea, ceratocone, ceratomalacia e cegueira. O diagnóstico de CIB foi baseado nos achados epidemiológicos e clínico-patológicos e confirmado pela cultura de uma cepa hemolítica de Moraxella bovis dos olhos de dois terneiros afetados. O alto coeficiente de letalidade (45%) neste surto foi atribuído a grave hemoncose intercorrente.

Moraxella bovoculi em casos de ceratoconjuntivite infecciosa bovina no Rio Grande do Sul

“…No Brasil, M. bovis e M. ovis têm sido alvo de relatos e pesquisas (Conceição & Turnes 2003, Chaves et al 2008, Carmo et al 2011 …”

Mortality caused by gastrointestinal nematodes in beef cattle submitted to an inadequate sanitary protocol

“…The macroscopic and microscopic changes observed in cattle necropsied in both outbreaks are compatible with the diagnosed parasitic diseases (Bianchin et al 1979, Carmo et al 2011, Hossa et al 2013, Uzal et al 2016. Cattle with severe T. axei infections have poor body condition, dehydration, edema of the abomasal folds, reddening and erosion and/ or ulceration of the mucosa, in addition to irregular or rounded white plaques that cover the affected mucosa together with a layer of mucus (Bianchin et al 1979, Uzal et al 2016.…”

“…In Outbreak II, although the histopathological examination was performed as a complement to the necropsy, as in all cases received by the LAP, the macroscopic changes are sufficient to conclude the diagnosis of hemonchosis, as it is possible to see specimens of Haemochus spp. in the content of the abomasum or adhered to the mucosa of this organ (Carmo et al 2011, Hossa et al 2013). In addition to the macroscopic changes observed in cattle in this outbreak, pale and friable liver, edema of the subcutaneous tissue in the ventral and mesenteric region, hydrothorax, hydropericardium, and ascites are changes that may occur and reflect anemia and hypoproteinemia caused by the helminth (Carmo et al 2011, Hossa et al 2013, Uzal et al 2016.…”

“…On the other hand, H. placei, in addition to being prevalent, has high parasitic intensity and high pathogenicity (Bianchin et al 1993, Borges et al 2001). In addition, larvae have a good ability to survive in the environment ), which makes it essential to adopt devermination protocols to avoid the occurrence of outbreaks (Carmo et al 2011, Hossa et al 2013.…”

“…In the 1970s and 1980s, there were outbreaks of worm disease in cattle that could result in mortality of up to 10% of calves (Bianchin et al 1993). In the current production system, deaths attributed to hemonchosis are not common in this species, although they are still reported (Carmo et al 2011, Hossa et al 2013.…”