minor mutation

minor mutation – a drug resistance mutation that have a big impact on whether a drug continues to work. This used to be called a secondary mutation.

major mutation

major mutation – a drug resistance mutation that have a big impact on whether a drug continues to work. This used to be called a primary mutation.


mega-HAART – a term for a drug combination that uses five or more HIV drugs, usually including 2–3 protease inhibitors. Rarely used now.


microbicide – a gel that may protect against infection.In reference to HIV, this is usually referring to a gel that could be applied before sex. In 2010 a study called Caprisa 004 provided the first evidence that a microbicide (in …

Mucosal lining

mucosal lining is the moist, inner lining of some organs and body cavities (such as the nose, mouth, vagina, lungs, and stomach). Glands in the mucosa make mucous, a thick, slippery fluid. A mucosal lining is also called a mucous …

Maternal-foetal microtransfusions

maternal-foetal microtransfusions are when small amounts of infected blood from the mother leak from the placenta to the baby during labour (or other disruption of the placenta).


mutation – a change in the genetic structure of an organism (including a virus like HIV). See resistance. Changing treatment and drug resistance.


multi-disciplinary – a team approach to care, involving several different professionals.


morbidity – medical term for illness.


mortality – medical word for death or dying.


monotherapy – using only one drug.


MSM – men who have sex with men.

mixed feeding

mixed feeding – combination of breastfeeding and bottle feeding.


mitochondria – energy producing factories that live inside other cells.

mL (millilitre)

mL (millilitre) – a measure of a volume of liquid. 1000 millititres = 1 litre.

mg (milligram)

mg (milligram) – abbreviation for milligram. 1000 milligrams = 1 gram.


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


meningitis – inflammation (-itis) of the meninges (part of fluid that surrounds the brain). Meningitis can be caused by different infections – ie bacterial meningitis (from bacterial infection), viral meningitis (form a virus) etc.

Minimum Effective Concentration (MEC)

Minimum Effective Concentration (MEC) – the lower level of a drug in the body that will still be effective. What happens when you take a drug?

median (average)

median (average) – where the results are all arranged in numerical order and the middle of the range is taken as the (median) average. See mean. What is an average.

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