Four sentinel herds comprising cattle, sheep and goats were established at
various localities in Saudi Arabia. Maternal bluetongue antibodies were det
ected in all four sentinel herds but disappeared in 4-6 months, immediately
followed by seroconversion in all. Serological results indicated that the
animals were recently exposed to BT virus serotypes 10, 12, 15 and 20. The
epidemiology of the disease in Saudi Arabia is discussed.