Five serogroups of<unk> es are recognized, reflecting the vertebrate hosts with which they are associated (primates, sheep and goats, horses, domestic cats, and cattle). The primate<unk> es are distinguished by the use of CD4 protein as a receptor and the absence of dUTPase. Some groups have cross-reactive gag antigens (e.g., the ovine, caprine, and feline<unk> es). Antibodies to gag antigens in lions and other large felines indicate the existence of another yet to be identified virus related to feline<unk>  and the ovine/caprine<unk> es.
Lentivirus
Passenger virus
Oncophage
Flavivirus
Oncolytic virus
Coronavirus
Coronavirus 
Arbovirus