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How Is HIV Transmitted?
Date: 2022/09/14

You can only get HIV by coming into direct contact with certain body fluids from a person with HIV who has a detectable viral load. These fluids are:

Blood
Semen (cum) and pre-seminal fluid (pre-cum)
Rectal fluids
Vaginal fluids
Breast milk

For transmission to occur, the HIV in these fluids must get into the bloodstream of an HIV-negative person through a mucous membrane (found in the rectum, vagina, mouth, or tip of the penis), through open cuts or sores, or by direct injection (from a needle or syringe).

艾滋病治疗

People with HIV who take HIV medicine as prescribed and get and keep an undetectable viral load can live long and healthy lives and will not transmit HIV to their HIV-negative partners through sex.

How Is HIV Spread from Person to Person?

HIV can only be spread through specific activities. In the United States, the most common ways are:
Having vaginal or anal sex with someone who has HIV without using a condom the right way every time or taking medicines to prevent or treat HIV. Anal sex is riskier than vaginal sex for HIV transmission. Learn more about the HIV risk associated with specific sexual activities.

Sharing injection drug equipment, such as needles, syringes, or other drug injection equipment (“works”) with someone who has HIV because these items may have blood in them, and blood can carry HIV. People who inject hormones, silicone, or steroids can also get or transmit HIV by sharing needles, syringes, or other injection equipment. Learn more about HIV and injection drug use.

HIV

Less common ways are:

An HIV-positive person transmitting HIV to their baby during pregnancy, birth, or breastfeeding. However, the use of HIV medicines and other strategies have helped lower the risk of perinatal transmission of HIV to less than 1% in the United States. Learn more.

Being exposed to HIV through a needlestick or sharps injury. This is a risk mainly for health care workers. The risk is very low.

HIV is spread only in extremely rare cases by:

Having oral sex. Oral sex carries little to no risk for getting or transmitting HIV. Theoretically, it is possible if an HIV-positive man ejaculates in his partner’s mouth during oral sex. Factors that may increase the risk of transmitting HIV through oral sex are oral ulcers, bleeding gums, genital sores, and the presence of other sexually transmitted diseases (STDs), which may or may not be visible. However, the risk is still extremely low, and much lower than with anal or vaginal sex.

Receiving blood transfusions, blood products, or organ/tissue transplants that are contaminated with HIV. The risk is extremely small these days because of rigorous testing of the U.S. blood supply and donated organs and tissues. (And you can’t get HIV from donating blood. Blood collection procedures are highly regular and very safe.)

Being bitten by a person with HIV. Each of the very small number of documented cases has involved severe trauma with extensive tissue damage and the presence of blood. This rare transmission can occur through contact between broken skin, wounds, or mucous membranes and blood or body fluids from a person who has HIV. There is no risk of transmission if the skin is not broken. There are no documented cases of HIV being transmitted through spitting as HIV is not transmitted through saliva.

Deep, open-mouth kissing if both partners have sores or bleeding gums and blood from the HIV-positive partner gets into the bloodstream of the HIV-negative partner. HIV is not spread through saliva.

Eating food that has been pre-chewed by a person with HIV. The only known cases are among infants. HIV transmission can occur when the blood from an HIV-positive caregiver’s mouth mixes with food while chewing and an infant eats it. However,  you can’t get HIV by consuming food handled by someone with HIV.

Content Source: HIV.gov
Date last updated: June 16, 2022

 


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