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Variation in Specificity of HIV Rapid Diagnostic Tests over Place and Time: An Analysis of Discordancy Data Using a Bayesian ApproachKlarkowski, Derryck; Glass, Kathryn; O'Brien, Daniel; Lokuge, Kamalini; Piriou, Erwan; Shanks, Leslie; Médecins sans Frontières, Operational Centre Amsterdam, Amsterdam, The Netherlands (Public Library of Science, 2013-11)Recent trends to earlier access to anti-retroviral treatment underline the importance of accurate HIV diagnosis. The WHO HIV testing strategy recommends the use of two or three rapid diagnostic tests (RDTs) combined in an algorithm and assume a population is serologically stable over time. Yet RDTs are prone to cross reactivity which can lead to false positive or discordant results. This paper uses discordancy data from Médecins Sans Frontières (MSF) programmes to test the hypothesis that the specificity of RDTs change over place and time.