| How HIV is transmitted? |
| You can become infected with HIV in several ways, including: |
| Sexual transmission: |
| You may become infected if you have vaginal, anal or oral sex with an infected partner whose blood, semen or vaginal secretions enter your body. You can also become infected from shared sexual devices if they're not washed or covered with a condom. The virus is present in the semen or vaginal secretions of someone who's infected and enters your body through small tears that can develop in the rectum or vagina during sexual activity. If you already have another sexually transmitted disease, you're at much greater risk of contracting HIV. Contrary to what researchers once believed, women who use the spermicide nonoxynol-9 also may be at increased risk. This spermicide irritates the lining of the vagina and may cause tears that allow the virus into the body. |
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| Transmission through infected blood: |
| In some cases, the virus may be transmitted through blood and blood products that you receive in blood transfusions. This includes whole blood, packed red cells, fresh-frozen plasma and platelets. In 1985, American hospitals and blood banks began screening the blood supply for HIV antibodies. This blood testing, along with improvements in donor screening and recruitment practices, has substantially reduced the risk of acquiring HIV through a transfusion. |
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| Transmission through needle sharing: |
| HIV is easily transmitted through needles and syringes contaminated with infected blood. Sharing intravenous drug paraphernalia puts you at high risk of HIV and other infectious diseases such as hepatitis. Your risk is greater if you inject drugs frequently or also engage in high-risk sexual behavior. Avoiding the use of injected drugs is the most reliable way to prevent infection. If that isn't an option, you can reduce your risk by sterilizing injection paraphernalia with household bleach or by participating in a needle exchange program that allows you to trade used needles and syringes for sterile ones. |
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| Transmission through accidental needle sticks: |
| Transmission of the virus between HIV-positive people and health care workers through needle sticks is low. Experts put the risk at far less than 1 percent. |
| Transmission from mother to child: |
| Each year, nearly 600,000 infants are infected with HIV, either during pregnancy or delivery or through breast-feeding. The rate of mother-to-child transmission in resource-poor countries is as much as 40 percent higher than it is in the developed world. But if women receive treatment for HIV infection during pregnancy, the risk to their babies is significantly reduced. Combinations of HIV drugs may reduce the risk of mother-to-child transmission even more. In the United States, most pregnant women are pre-screened for HIV, and anti-retroviral drugs are readily available. Not so in developing nations, where women seldom know their HIV status, and treatment is often limited or nonexistent. When medications aren't available, Caesarean section is sometimes recommended instead of vaginal delivery, but this isn't a good option for women in resource-poor countries, where it poses additional risks for both mother and child. Other options, such as vaginal disinfection, haven't proved effective. |
| Other methods of transmission: |
| In rare cases, the virus may be transmitted through organ or tissue transplants or unsterilized dental or surgical equipment. |
| What are the ways through which HIV is not transmitted? |
| To become infected with HIV, infected blood, semen or vaginal secretions must enter your body. You can't become infected through ordinary contact like hugging, dancing or shaking hands with someone who has HIV or AIDS. |
