a noncontagious, infectious disease of horses and other Equidae. It is caused by an RNA virus classified in the Lentivirus genus, family Retroviridae., an acute or chronic viral disease of Equidae, found wherever there are horses and characterized by intermittent fever, depression, progressive weakness, loss of weight, edema, and progressive or transitory anemia, pms. kabjalistel täheldatav haigus, mida tekitab Retroviridae sgk-a kuuluv, ribonukleiinhapet sisaldav viirus, mida siirutavad verd imevad putukad. Haigus levib hrl. hilissuvel, põhjustab vahelduvat või pidevat palavikku, veremuutusi, üldist kehvveresust ja verejooksukalduvust.