In any period of AIDS, no matter it is the acute infection period, the asymptomatic period or the AIDS period, its transmission way is the same, the so-called latent period refers to the asymptomatic period. The main ways of transmission of AIDS are blood transmission, sexual contact transmission and vertical transmission from mother to child, but of course there are other ways of transmission, such as irregular tooth extraction, tattooing, pedicure and sharing of injection needles; there are also medical transmission, such as hemodialysis, transplantation of organs containing HIV, etc. Some of the transmission is caused by the occupational health care workers. There is partly occupational exposure of health care workers, all of which carry the risk of HIV transmission.