A survey of parasites of the swift fox (Vulpes velox) was conducted in Colo
rado during August 1989 and January 1990. One coccidean, six nematode, and
one cestode species were identified from 14 foxes. Two tick and one flea sp
ecies were collected from 22 foxes. None of 15 foxes sampled had evidence o
f Dirofilaria immitis microfilaremia.