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A and C show the locations of the hemagglutinin (HA) and nucleoprotein (NP) primer and probe sequences for the dual-gene duplex pandemic influenza A/H1N1/2009-specific assay. B and D show the locations of the corresponding HA and NP primer and probe sequences for the CDC/World Health Organization website method (http://www.who.int/csr/resources/publications/swineflu/CDCrealtimeRTPCRprotocol_20090428.pdf, last accessed April 29, 2009).
