Glossary

qualitative (in a study) – where what is being measured either fits one of several categories, or includes descriptive results.

T-cell – a type of white blood cell (lymphocyte) that are part of the immune system and that mature in the thymus (T). CD4 cells are also called T-cells.

prematurity (pregnancy) – when a baby is delivered after only 37 weeks or less.

methadone – a man-made opiate that used to treat heroin addiction. See also buprenorphine.

virology – the study of viruses.