What is HIV-1/2 antigen antibody?
Positive HIV-1 antibody but negative HIV-2 antibody results indicate the presence of HIV-1 infection. Together with reactive initial combined HIV-1/-2 antigen and antibody test results, individuals with such results are presumed to have HIV-1 infection.
What are HIV antigens?
An antigen is a part of a virus that triggers an immune response. If you’ve been exposed to HIV, antigens will show up in your blood before HIV antibodies are made. This test can usually find HIV within 2–6 weeks of infection. The HIV antibody/antigen test is one of the most common types of HIV tests.
What is the difference between hiv1 and hiv2?
HIV-1 is the most common type of HIV and accounts for 95% of all infections, whereas HIV-2 is relatively uncommon and less infectious. HIV-2 is mainly concentrated in West Africa and the surrounding countries. HIV-2 is less fatal and progresses more slowly than HIV-1.
Does HIV-2 have antigen?
Due to the genetic difference, HIV-1 and HIV-2 antigens are distinct enough that if a diagnostic test is developed only to detect HIV-1, it will not reliably detect HIV-2. However, tests which are sensitive to both types of virus are available.
Is HIV positive or negative?
HIV negative means you have no signs of HIV in your blood. HIV positive means that you do and have been infected with HIV. But there is a scenario when a negative HIV test may not be all that it appears. When testing for HIV, there is a short window period when a person can test negative and actually have the virus in his or her system.
Is HIV reactive or nonreactive?
A non-reactive HIV test means that HIV was not found in that testing sample. This test result is commonly referred to as “negative,” although a person who tests negative for HIV may nevertheless actually be HIV positive. HIV tests are used to find antibodies to the virus.
What are the types of HIV?
HIV is the human immunodeficiency virus. It is the virus that can lead to acquired immune deficiency syndrome, or AIDS. There are two types of HIV, HIV-1 and HIV-2. In the United States, unless otherwise noted, the term “HIV” primarily refers to HIV-1.
When do HIV antibodies appear?
Average is 25 days. After an exposure to hiv, most people (if they become hiv-positive) will develop antibodies that can be detected by HIV tests sometime between 2 to 8 weeks with the average of 25 days. 97% will develop detectable antibodies within 3 months and the rest may develop antibodies as late as 6 months (though very rare).