- Wasting syndromesearch for term
The involuntary weight loss of 10 percent of baseline body weight plus either chronic diarrhoea (two loose stools per day for more than 30 days) or chronic weakness and documented fever (for 30 days or more, intermittent or constant) in the absence of a concurrent illness or condition other than HIV infection that would explain the findings.
- Western blotsearch for term
A laboratory test for specific antibodies to confirm repeatedly reactive results on the HIV ELISA or EIA tests. In the U.S. Western Blot is the validation test used most often for confirmation of these other tests.
- White blood cellssearch for term
- WHO clinical staging systemsearch for term
A method for categorizing HIV-infected individuals according to the severity of their disease. Four stages are defined, and individuals are always categorized according to the most severe symptom they have experienced thus far. Stages 1 and 2 are relatively asymptomatic. Illnesses defining of stage 3 include oral infections, recurrent vulvovaginal candidiasis and diarrhoea. Stage 4 corresponds to clinical AIDS, and includes conditions such as Kaposi’s sarcoma, extrapulmonary tuberculosis and cryptococcal meningitis.
- Wild-type virussearch for term
The original type of HIV, unchanged by having developed any resistance to antiretroviral drugs. Also, 1. the prevalent type of a virus in the host population before genetic manipulation or mutation; 2. virus that is isolated from a host as opposed to one grown in a laboratory culture.
- Window Periodsearch for term
The time between the initial (first) infection and the development of detectable HIV antibodies. During this time the antibody test will be falsely negative. The test will be negative even though the person is actually infected with HIV. Antibodies are usually detected after about 6 weeks following infection. Some individuals may take 12 weeks before the antibodies are detected. Even though the test is negative during early infection, the person is able to pass on the virus to others during this window period.
- Window periodsearch for term