Congenital Baylisascaris sp. larval migrans in a newborn lamb

A 3-day-old domestic lamb, moribund since birth, was submitted as part of a diagnostic effort concerning weak newborn lambs due possibly to congenital Bluetongue virus infection. Gross lesions were consistent with such an eve nt. Histologic examination of cerebrum and cerebellum revealed multiple gra nulomas, the age of which required prenatal development. These contained la rvae compatible with those of Baylisascaris sp. This finding together with evidence Chat parents of children with neural larval migrans have been sero positive for ascarid antigen suggests that mammalian fetuses in general sho uld be added to the list of those at risk for neural larva migrans due to a scarid parasites.