Based on large-scale clinical data and scientific research, it has been clearly demonstrated that HIV is not transmitted through insects such as mosquitoes. Three modes of transmission of AIDS are currently recognized: first, through sexual transmission. Second, through blood transmission. Third, through mother-to-child transmission. Currently, sexual transmission is the most common. Transmission through blood is mainly due to invasive operations in irregular places, such as tattooing in irregular institutions, dental treatment in irregular dental institutions, and other operations with piercing. Mother-to-child transmission occurs when a pregnant woman is HIV-positive and fails to stop the infection in time. HIV is very fragile and is rapidly inactivated when it leaves the body, so it cannot be contracted through normal daily contact.