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The recent development of serological assays for human immunodeficiency virus (HIV) that are able to distinguish recent from long-standing infection has generated an important tool for HIV surveillance. In the European Union (EU), a number of different serological assays are being used, and there is the danger that that HIV incidence estimates in different countries, or even within a country, may not be comparable.

Workshop on the Serological Testing Algorithm for Recent HIV Seroconversion (STARHS) and HIV Incidence Estimates, Stockholm, 11-12 March 2008