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1. Control of chronic respiratory disease I. The effects of chlortetracycline (CTC) and terephthalic acid (TPA).

2. Control of chronic respiratory disease II. The effect of low calcium diet, terephthalic acid and chlortetracycline.

3. Dipping of hatching eggs in erythromycin for the control of Mycoplasma.

4. Control of chronic respiratory disease. IV. The effect of a low-calcium diet and high concentrations of chlortetracycline of the isolation of Mycoplasma from experimentally infected chicks.

5. Control of chronic respiratory disease. V. Artificial exposure of young chicks to Mycoplasma gallisepticum.

6. Control of chronic respiratory disease III. Isolation of mycoplasma as infleunced by potentiated chlortetracycline and time interval after exposure.