The polio vaccine theory was one of a number being debated. The researchers examined reports from three independent research laboratories into the origin of Aids. Other theories suggest that Aids jumped to humans as a result of a bite or after a hunter became infected while capturing an ape, or preparing its flesh for eating. Alternative explanations for the sudden emergence of Aids centre on deforestation bringing monkeys and apes into greater contact with humans, coupled with political and social upheavals. Figures suggest that there is a new case of HIV infection every 11 seconds.
Work is ongoing around the world to develop a vaccine but as yet there is no known cure.