A comparative study of Mycoplasma gallisepticum vaccines in young chickens.

摘要: Ten-day-old leghorn chickens were vaccinated with the F, ts-11, or 6/85 strain of Mycoplasma gallisepticum (MG) via intraocular route subcutaneously MG bacterin and challenged by aerosol R at 30, 60, 90 days post-vaccination. Respiratory reaction post-vaccination, serological response, persistence vaccine strain, protection against challenge compared. In general, ts-11 strains induced a milder post-vaccination than F-strain, produced weaker did not persist as long in upper respiratory tract. The F-strain-vaccinated had fewest mildest air-sac lesions post-challenge, groups somewhat less protection, bacterin-vaccinated no detectable airsacculitis. also organisms trachea 10 postchallenge.