title: Epidemiological investigations on Dictyocaulus viviparus (Bloch, 1782) infection in cattle.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D004022:Dictyocaulus Infections / Q000453:epidemiology*; D009864:Ontario; D012621:Seasons