Preventing AIDS
HIV spreads most commonly through unprotected sexual contact with an infected partner. It can also spread through contact with infected blood, usually through needle sharing amongst drug users. Mothers can pass HIV on to their babies, though the risk of this is much lower if anti-HIV drugs are taken during pregnancy. Scientists are finding it difficult to produce a vaccine against HIV as the surface of the virus constantly changes. So the only way to prevent infection is to avoid contracting the virus.
