Viruses as teratogens.
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The ability of certain viruses to affect prenatal development in domestic animals is well documented. However, differentiating a viral-induced malformation from those caused by genetic or other environmental causes is a diagnostic dilemma. Understanding how viruses interact with their embryo-fetal hosts and the potential consequences on prenatal development requires refining and dispelling some old concepts and injecting new insights into this diagnostic challenge. This article discusses several viral teratogens affecting domestic animals: Akabane, bluetongue, Cache Valley, Japanese B encephalitis, bovine viral diarrhea, Border disease, Chuzan, epizootic hemorrhagic disease, hog cholera, Rift Valley fever, and Wesselsbron disease viruses.