Nasal secretions, leukocytes and preputial or vaginal swabs from a group of 15 captive wild ruminants, comprising six pronghorn antelope (Antilocapra americana), seven fallow deer (Dama dama) and two mule deer (Odocoileus hemionus), and from 50 free-ranging pronghorns in southern Alberta, were examined for viral agents. Captive animals were given injections of dexamethasone daily for 6 days in attempts to reactivate latent infections. Specimens were collected at 2-3 day intervals from days 0 to 18. Free-ranging pronghorns were sampled only once, at the time of capture. Fifteen viral isolates were obtained from the animals: six isolates of parainfluenza 3 (PI3) from nasal swabs from one fallow deer and one mule deer; five isolates of herpesvirus from leukocytes, vaginal, preputial and nasal swabs from three fallow deer; and four isolates of PI3 from nasal secretions of the 50 free-ranging pronghorns.

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