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Blood MxA protein levels in relation to the duration of fever or respiratory symptoms before MxA measurement. All symptomatic children with recorded duration of symptoms for 1–14 days and with (n = 103) or without (n = 21) detected virus are included. Spearman's rho −0.193; p 0.032; correlation line (– – –); 175 μg/L cut-off (- - -).
