Getah virus is a mosquito-borne virus that can cause a mild, self-limiting illness in horses. This virus is widely distributed from Eurasia to Australasia, and antibodies have been found in many species of animals. However, clinical disease seems to be very rare. The first known outbreak occurred in Japan in 1978; it affected racehorses at two densely populated training stables. A small number of cases was also reported in Japanese horses in 1983. In 1990, clinical disease was reported outside Japan, at a thoroughbred breeding farm in India. In addition, Getah virus is suspected of being pathogenic in pigs.