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Development and external validation of the FluScoreVax risk score for influenza that incorporates vaccine status (EAST-PC) [Acute respiratory infections]

Annals of Family Medicine

Objective: To develop and externally validate a simple risk score for influenza diagnosis based only on vaccination history and patient-reported symptoms. Results: We developed a risk score with 6 items (subjective fever, interfered with usual activity, headache, wheeze, phlegm, and recent flu vaccine) and a range from -5 to 6 points.