Grand Teton National Park Report
Lungworm of elk, Dictyocaulus hadweni (syn: D. viviparus) was first designated as Strongylus filaria in elk and red deer, (Blair, 1903) and lungworm was then and in 1905 reported to cause bronchopneumonia in elk. (Blair 1905). Records of lungworm in elk in Yellowstone and the Tetons were rather incomplete until Rush (1932), Mills (1936), Alderson (1951) and others listed internal parasites found in elk. It is surprising that Mills did not find D. hadweni in 100 elk taken from the Yellowstone herd. It is interesting to note that a high percentage of the elk in Teton National Park are positive for lungworm in the spring. Fewer elk are infected as the summer and fall vegetation is usually sufficiently good to allow the elk an abundance of food and a resultant physiological condition that is excellent. Perhaps elk serum proteins are somewhat low in the April-May period when the physiological "low" is reached by the elk. The lack of immunoglobulins may, in part, explain the high prevalence of lungworm infections in elk of the Tetons during early spring months.
Bergstrom, Robert C.
"Parasites of Ungulates in the Jackson Hole Area: Scarabaeoid Beetles Acting on Lungworm, Distyocaulus hadweni, Larvae in Elk Feces 1981,"
University of Wyoming National Park Service Research Center Annual Report: Vol. 5
, Article 8.
Available at: https://repository.uwyo.edu/uwnpsrc_reports/vol5/iss1/8