Testing for HIV in saliva works well.
D000163:Acquired Immunodeficiency Syndrome / Q000097:blood / Q000175:diagnosis*; D015483:HIV Antibodies / Q000032:analysis* / Q000097:blood; D015658:HIV Infections / Q000097:blood / Q000175:diagnosis*; D015497:HIV-1; D006801:Humans; D012463:Saliva / Q000276:immunology*
D015483:HIV Antibodies