title: Influence of outdoor winter environment on the course of infectious bovine keratoconjunctivitis.
abstract: The effect of environmental conditions on the onset, severity, and duration of Moraxella bovis infection and subsequent clinical disease was studied. Twelve calves were used; 6 were maintained under usual isolated experimental conditions (inside), and 6 were kept under normal feedlot conditions (outside) during the winter (-20 to +15 C). The cattle housed inside had a higher infection rate, a milder disease, and longer duration of infection than did the cattle kept out side. Seemingly, the stress of the cold weather caused a more severe disease of shorter duration.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology*; D003080:Cold Temperature / Q000009:adverse effects*; D004781:Environmental Exposure; D006799:Housing, Animal; D007637:Keratoconjunctivitis / Q000209:etiology / Q000662:veterinary*; D012621:Seasons