title: WHO external quality assessment project for detecting influenza virus subtype A by polymerase chain reaction - summary analysis, 2009.
mesh_terms: D006801:Humans; D053124:Influenza A Virus, H5N1 Subtype / Q000302:isolation & purification; D009980:Influenza A virus / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis / Q000821:virology*; D007753:Laboratories / Q000592:standards*; D016133:Polymerase Chain Reaction / Q000592:standards*; D011786:Quality Control; D014944:World Health Organization