The cities with the largest number of HIV infections in China are mainly concentrated in Yunnan, Guangxi, Henan, Sichuan, Xinjiang and Guangdong. At present, through investigation, it is found that colleges and universities have also become the hardest hit areas of AIDS infection. At present, AIDS has become a public health problem that seriously threatens the health of people all over the world. It targets T4 lymphocytes, which are the most important in the human immune system, devours and destroys T4 lymphocytes in large quantities, thus destroying the human immune system and finally causing it to collapse, leading to illness and death due to the loss of resistance to various diseases.

Transmission path:

HIV mainly exists in the blood, semen, vaginal secretions and milk of infected people and patients.

① Sexual behavior: unprotected sexual behavior with infected partners, including homosexual, heterosexual and bisexual contact.

② Intravenous drug use: It is a very important way to spread HIV by using unsterilized injection tools used by infected people with others.

③ Mother-to-child transmission: During pregnancy, childbirth and breastfeeding, mothers infected with HIV may spread to fetuses and babies.

④ Blood and blood products (including artificial fertilization, skin transplantation and organ transplantation). Shaking hands, hugging, courtesy kissing, eating and drinking together, using toilets and bathrooms, using offices, public transportation and entertainment facilities will not spread HIV.