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.