MSD Veterinary Manual

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Bloat in Ruminants

Peter D. ConstableBVSc (Hons), MS, PhD, DACVIM, College of Veterinary Medicine, University of Illinois at Urbana-Champaign;Bloat is an overdistention of the rumenoreticulum with the gases of fermentation, either in the form of a persistent foam mixed with the ruminal contents, called primary or frothy bloat, or...Read All

Contagious Footrot in Sheep

Evelyn MacKayDVM, Texas A&M University;When there is invasion by Dichelobacter nodosus of interdigital dermatitis, contagious footrot results. Whereas in Australia, footrot is separated into benign or virulent categories,...Read All

Rift Valley Fever in Animals

Peter N. ThompsonBVSc, MMedVet, PhD, Department of Production Animal Studies, Faculty of Veterinary Science, University of Pretoria;Rift Valley fever is a peracute or acute mosquito-borne zoonotic disease of domestic and wild ruminants, largely confined to sub-Saharan Africa but with high potential for wider transmission. It is characterized by abortions and neonatal mortality in ruminant animals. Diagnosis depends on histopathological examination of samples of the liver and identification of the virus in tissues. Effective vaccines are available.Read AllPreviousNext

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Avian Influenza

Influenza A viruses are divided into 17 hemagglutinin subtypes (H1-16, H19). Which of the following subtypes is most likely to cause a highly pathogenic form of avian influenza in poultry?