Lincomycin-spectinomycin, antibacterial and antimycoplasmal for use in chickens up to 7 days of age as an aid in the control of airsacculitis caused by either M. synoviae or M. gallisepticum susceptible to lincomycin-spectinomycin, and Complicated Chronic Respiratory Disease (Air Sac Infection) caused by E. coli and M. gallisepticum susceptible to lincomycin-spectinomycin. For use in chickens only.