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The AIDS epidemic is a disaster on many levels. In the most affected countries in sub-Saharan Africa, where prevalence rates reach 20 per cent, development gains are reversed and life expectancy may be halved. For specific groups of marginalized people - injecting drug users, sex workers and men who have sex with men - across the world, HIV rates are on the increase. Yet they often face stigma, criminalization and little, if any, access to HIV prevention and treatment services. …