I have used this a year ago to treat air sac infection, fowl cholera. Bought Terramycin powder on the internet.
Oxytetracycline
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Injectible, water-soluble powder
LA-200 injectible,
Duramycin 72-200 injectible, Terramycin powder (discontinued),
Duramycin powder
Tetracyclines --Infectious Coryza in certain chickens
Mycoplasma leading to Chronic Respiratory Disease (CRD)
Possibly: air sac infection, fowl cholera 1/8 tsp soluble Terramycin per cup of drinking water. Mix fresh daily for 7-14 days.
* Don't feed dairy products (yogurt, etc) within 2 hrs of Terramycin or effectiveness is reduced.
***Don't eat eggs during treatment. ***