Abstract
Summary A number of outbreaks of Bluetongue have, been observed in sheep in Cyprus at recurrent intervals since, 1924. The most serious was in 1943 when the virus was isolated and identified. The symptoms observed in Cyprus are, described and correspond closely with those described from South Africa. The virus was studied in the laboratory, but attempts to attenuate it by serial passage through sheep were unsuccessful. Various vaccine strains received from Onderstepoort were tested, but the only one which gave satisfactory protection under Cyprus conditions was the original Cyprus virus attenuated at Onderstepoort by serial passage through chick embryos. This egg-attenuated vaccine was used with success in subsequent outbreaks of the disease in 1946 and 1947.
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