title: Prevalence of Mycoplasma and Chlamydia in the nasal flora of dairy calves.
abstract: Nasal swabs from dairy calves in 20 selected herds were collected once in each of three sampling periods in one year and cultured for mycoplasmas and chlamydiae. Seventy-seven of 411 calves (19%) and 16 of 20 herds (80%) were positive for mycoplasmas at least once throughout the year, and all of 378 calves sampled from the 20 herds were negative for chlamydiae. Thirty-one percent of the isolates were Mycoplasma bovirhinis; other species isolated less frequently were Mycoplasma bovis, Mycoplasma arginini, and Acholeplasma laidlawaii. There was no evidence of respiratory tract disease at the time of sampling in calves studied.
mesh_terms: D000818:Animals; D002417:Cattle / Q000382:microbiology*; D002689:Chlamydia / Q000302:isolation & purification*; D003429:Cross Reactions; D009174:Mycoplasma / Q000302:isolation & purification*; D009666:Nose / Q000382:microbiology*; D012621:Seasons