Abstract
Summary The adaptation of a Kenya strain of fowl pox virus to the chorioallantoic membrane of embryonated eggs is described. When used as a vaccine, consisting of infected chorio-allantoic membranes suspended in glycerine and broth, the egg-adapted virus provoked a solid immunity, lasting at least twelve months against challenge with homologous scab virus. The egg-adapted vaccine remained viable for 6 to 12 weeks at room temperature and for 6 to 12 months at refrigerator temperature.
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