How sure are we that HIV causes AIDS?
D000163:Acquired Immunodeficiency Syndrome / Q000453:epidemiology / Q000821:virology*; D015984:Causality; D019317:Evidence-Based Medicine; D006678:HIV / Q000472:pathogenicity*; D006801:Humans; D012307:Risk Factors; D013019:South Africa / Q000453:epidemiology