1, infection with hiv virus routinely antigen can be detected 2 to 18 d after infection, antibody is usually detected 3 to 8 weeks after infection. 2, the incubation period of syphilis is 9-90 days, an average of 3 weeks, patients usually start to develop 2 to 4 weeks after syphilis infection. Some people have counted the time in relation to the emergence of antibodies: (1) persistent irregular fever of unknown origin of 38°C or more for 1 month; (2) chronic diarrhea more than 3 times/day for 1 month; (3) weight loss within 6 months; (4) recurrent oral Candida albicans infections; (5) recurrent herpes simplex virus infections or herpes zoster virus infections; (6) Pneumocystis pneumonia ( (7) recurrent bacterial pneumonia; (8) active tuberculosis or nontuberculous mycobacteriosis; (9) deep fungal infections; (10) occupying lesions of the central nervous system; (11) dementia in middle-aged adults; (12) active cytomegalovirus infection; (13) toxoplasma encephalopathy; (14) Penicillium infection; (15) recurrent sepsis; (16) skin (16) Kaposi’s sarcoma, lymphoma of the mucosa or viscera.