Kistner T P, Wyse D
J Wildl Dis. 1979 Oct;15(4):561-2. doi: 10.7589/0090-3558-15.4.561.
Transplacental transmission of Protostrongylus sp. was documented for the first time in California bighorn sheep (Ovis canadensis californiana) by recovery of third stage larvae from two fetuses.