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b'To prevent AIDS it is essential to identify the factors driving the risk of infection in a particular community, rather than just applying a good \\u2014 but un-researched \\u2014 idea or a \\u201cone size fits all\\u201d approach to your strategy, according to Justin Parkhurst, of the London School of Hygiene and Tropical Medicine, who talked at the World AIDS Day symposium held at the School. He tells Sarah Maxwell about the need for tailoring the prevention strategy to match the underlying social and other factors driving HIV infection in any particular community, and he warns that this is context specific: and can differ greatly from one community to another.'