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Three recent studies challenge the assumption that the main cause of the spread of HIV in Africa is unprotected sex. They argue that it is unsafe injections which transmit the infection on a far larger scale than has previously been thought. Most experts assume that unsafe sex between men and women is responsible for 90% of HIV infections in sub-Saharan Africa. The medical reuse of contaminated needles and syringes is thought to account for another 5%. The authors of the controversial trio of papers recently published in the International Journal of STD and AIDS (2003;14;144-73) take a radically different view. (excerpt)

Researchers argue that unsafe injections spread HIV more than unsafe sex.