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HIV is spread 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). [18]
In most cases, HIV is a sexually transmitted infection and occurs by contact with or transfer of blood, pre-ejaculate, semen, and vaginal fluids. [ 5 ] [ 6 ] Non-sexual transmission can occur from an infected mother to her infant during pregnancy , during childbirth by exposure to her blood or vaginal fluid, and through breast milk .
After the virus enters the body there is a period of rapid viral replication, leading to an abundance of virus in the peripheral blood. During primary infection, the level of HIV may reach several million virus particles per milliliter of blood. [2] This response is accompanied by a marked drop in the numbers of circulating CD4 + T cells.
HIV is carried in body fluids and is spread by sexual activity. It can also be spread by contact with infected blood, breastfeeding, childbirth, and from mother to child during pregnancy. [73] When HIV is at its most advanced stage, an individual is said to have AIDS (acquired immunodeficiency syndrome). [74]
A study on the effect of semen in male-to-female HIV transmission in both humans and non-human primates (rhesus macaques), noted that regular intravaginal exposure to a healthy male's semen modulates the microenvironment in the female reproductive tract (FRT) and, paradoxically, improves the resistance in females against acquiring HIV by ...
The most updated HIV testing protocols recommend using the HIV-1 and HIV-2 antigen/antibody combination immunoassay as the initial screening test for an HIV infection. [22] This blood test assesses whether or not the mother has created antibodies , which are disease-fighting proteins of the immune system, against the HIV-1 and HIV-2 viruses.
Different viruses can have different routes of transmission; for example, HIV is directly transferred by contaminated body fluids from an infected host into the tissue or bloodstream of a new host while influenza is airborne and transmitted through inhalation of contaminated air containing viral particles by a new host.
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.
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related to: body fluids that transmit hiv