title: Detection of influenza virus subtype A by polymerase chain reaction: WHO external quality assessment project summary analysis, 2011.
mesh_terms: D006801:Humans; D009980:Influenza A virus / Q000235:genetics / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis* / Q000821:virology*; D007753:Laboratories / Q000592:standards*; D016133:Polymerase Chain Reaction / Q000592:standards*; D011785:Quality Assurance, Health Care; D011786:Quality Control; D058028:Research Report; D014944:World Health Organization