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Clinical symptoms in pigs after infection with PrV-Ka and PrV-9112C2. Four piglets per group were infected intranasally with either PrV-Ka (⧫) or PrV-9112C2 (■). Every animal in each group was observed for symptoms of AD twice a day and assigned a clinical score correlating to five levels of severity as indicated in Materials and Methods. Average values and standard deviations of four pigs from each group are shown. (†) denotes death of animals.
