Pen Trial Studies on the Use of Live Vaccines to Displace Virulent Mycoplasma gallisepticum in Chickens

Abstract excerpt

Groups of 10 8-wk-old chickens that had been vaccinated 4 wk previously with the F strain, ts-11, or 6/85 strain of Mycoplasma gallisepticum (MG) were challenged by placing them in contact with 20 chickens that had been previously infected with the virulent R strain of MG. Each month, the 10 oldest chickens were removed from each pen and replaced with 10 vaccinated chickens to return the total number of chickens...

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