HIV infection rates in different behaviors (Peking University study)

AIDS is a dangerous infectious disease, caused by HIV infection.

AIDS is usually transmitted by sexual intercourse and blood, which is inevitable. It is necessary for us to know the transmission rate of AIDS, so as to warn ourselves to be prepared as soon as possible.

In this article, we used the scientific research of Peking University in China to calculate the probability of HIV infection under different circumstances.

HIV infection rate

The probability of a behavioral spread without protection measures[1]:

Shared syringe drug0.67 %
Transfusion transmission90%-100%
Needle stab wound0.3%-0.5%
Male homosexual anal sex0.5%-3.0%
Male to female ( vaginal intercourse )0.1%-0.2%
Female pass to male ( vaginal intercourse )0.03%-0.1%
Mother-to-child transmission13~48%

AIDS blood transmission rate

Intravenous drug abuse: sharing syringes or lax disinfection of syringes among intravenous drug users is a risky behavior for HIV infection, with a single infection probability of 0.67%.

Blood or blood products: mainly refers to the blood or blood products contaminated with HIV, the single transmission probability between 90 and 100%.

Iatrogenic infection: it mainly refers to the infection of medical service recipients with HIV due to unclean medical devices, and also includes the exposure of medical staff to the body fluids of the infected/patient when providing medical services, resulting in HIV infection. Accidental exposure of an HIV contaminated instrument such as a needle to the skin or mucous membrane to a bodily fluid containing HIV is 0.3 to 0.5 percent likely to occur in a single infection.

AIDS sexual transmission rate

Sexual contact transmission is the main route of HIV transmission in the world at present, about 70% ~ 80% of the infected people in the world are infected with HIV through sexual contact, and women account for the majority of them.

Most of these women have multiple sexual partners. Among them, heterosexual sexual contact transmission accounted for more than 70%, and male homosexual sexual contact transmission accounted for 5% ~ 10%.

According to the survey, the infection rate of men with multiple sexual partners is 7% ~ 9%, women 23%.

According to the study, a healthy man who has sex once with an hiv-infected woman has a one-in-300 risk of infection. A healthy woman who has sex once with a man who is infected with HIV has a 1 in 100 risk of becoming infected. If the woman has any other sexually transmitted disease, the risk increases to 5 to 3.33 percent.

Having unprotected intercourse (anal sex) is associated with a 0.5 to 3 percent risk of HIV transmission among gay men. In heterosexual sexual contact, the probability of male to female is 0.1 ~ 0.2%, and the probability of female to male is 0.03 ~ 0.1%.

Mother-to-child transmission (PMTCT)

Two or more parents infected with HIV can victimize an innocent baby.

Infected infants usually do not survive more than 2-3 years, and the rate of HIV infection among infants born to hiv-infected women is about 1/3 (natural incidence of mother-to-child transmission: 13-48%).

Infected with HIV mothers in pregnancy, the blood of HIV can be directly through the placenta into the body of the baby, so that the baby infected with HIV.

Pregnant mothers during childbirth, when the baby through the mother’s birth canal, can be infected with the mother’s HIV.

Infected with HIV mothers, milk contains HIV, when the baby sucking milk, can be infected with AIDS.

Why do you want to prevent AIDS?

HIV is a virus that attacks the body’s immune system. It takes CD4T lymphocytes, the most important cells in the human immune system, as the main target, and destroys them in large quantities, so that the human body loses immune function[2].

Therefore, the human body is prone to various diseases, and can occur malignant tumors, high mortality. The average incubation period of HIV in the human body is 8 to 9 years. Before AIDS, people can live and work without any symptoms for many years.

It takes years to people living with HIV, or even 10 years or more after the incubation period can develop AIDS patients, because of the body’s resistance to extreme loss will appear a variety of infections, such as herpes zoster, oral fungal infections, tuberculosis, special enteritis caused by pathogenic microorganisms, pneumonia, encephalitis, candida, lung sporozoan and other pathogens causing serious infections and so on, often occur in the late malignant tumor, and long-term consumption, and systemic failure and death.

Despite the great efforts of many medical researchers around the world, there is still no effective medicine to cure AIDS and no effective vaccine to prevent it.

Prevention of AIDS, is a must, but also can not be ignored.


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