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(a) AIDS - (Acquired immune deficiency syndrome or acquired immunodeficiency syndrome) is a syndrome caused by a virus called HIV (Human Immunodeficiency Virus). ... This susceptibility worsens as the syndrome progresses. HIV is found in the body fluids of an infected person (semen and vaginal fluids, blood and breast milk).

(b) Malaria - Malaria is an infectious disease caused by a parasite: it is spread by the bite of an infected mosquito. People catch malaria when the parasite enters the blood. ... The Plasmodium gets into people by the bites of mosquitoes. The Plasmodium is in the mosquito's special saliva.