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As the infection progresses, it interferes more with the immune system, increasing the risk of developing common infections such as tuberculosis, as well as other opportunistic infections, and tumors that rarely affect people who have working immune systems.Due to their nonspecific character, these symptoms are not often recognized as signs of HIV infection.
CDC supports biomedical approaches to HIV prevention.
They represent approximately 1 in 300 infected persons.
HIV is transmitted by three main routes: sexual contact, significant exposure to infected body fluids or tissues, and from mother to child during pregnancy, delivery, or breastfeeding (known as vertical transmission).
Because of its relatively poor capacity for transmission, HIV-2 is largely confined to West Africa.
After the virus enters the body there is a period of rapid viral replication, leading to an abundance of virus in the peripheral blood.
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If a woman is untreated, two years of breastfeeding results in an HIV/AIDS risk in her baby of about 17%. Due to the increased risk of death without breastfeeding in many areas in the developing world, the World Health Organization recommends either: (1) the mother and baby being treated with antiretroviral medication while breastfeeding being continued (2) the provision of safe formula.