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Edward Hooper ![][1] Penguin Press, £25, pp 1070ISBN 0 713 99335 0Rating: ![Graphic][2] ![Graphic][3] ![Graphic][4] Does it really matter how AIDS started? Not long after AIDS was described in the United States, Europe, and Haiti, it became evident that several countries in sub-Saharan Africa had far greater proportions of people already affected. The belief emerged that the human immunodeficiency viruses arose in Africa. Thanks to molecular technology, the HIV-2 virus, mainly limited to west Africa, was found to be identical in genome organisation to a simian virus (SIV) in the local sooty mangabey. Evidence accumulated about the close relation between the now pandemic HIV-1 and chimpanzee SIVs in central Africa.How did the viruses transmit from monkeys and apes to humans, to cause the most important zoonosis yet known? And when? … [1]: /embed/graphic-1.gif [2]: /embed/inline-graphic-1.gif [3]: /embed/inline-graphic-2.gif [4]: /embed/inline-graphic-3.gif

The river: A journey back to the source of HIV and AIDS