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Simian betaretroviruses (formerly Type D retroviruses; SRV) are a group of closely related retroviruses for which the natural host species are Asian monkeys of the genus Macaca. Five serotypes have been identified by classical neutralization assays and three additional untyped variants have been reported (SRV Tsukuba , SRV-6, SRV-7). These viruses may be significant pathogens in macaque colonies,...