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Influenza A Ct values measured in anterior nasal swab samples plotted by days since symptom onset for PCR-positive symptomatic adults (day 0 = the first day of symptoms). A, Ct value for influenza A target 1 (PA, a phosphoprotein subunit of influenza RNA polymerase); B, Ct value for influenza A target 2 (PB2, polymerase basic 2 subunit of influenza RNA polymerase). Abbreviations: Ct, cycle threshold; PCR, polymerase chain reaction.
