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Specimens
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Combined nasal and oropharyngeal swabs
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Blood (Sera)
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Endotracheal aspirate (for intubated infants)
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Infant illness
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Date of illness onset and resolution
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Maternal-reported symptoms
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Ambulatory and self-care for illness
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Clinical signs at admission and per day
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Clinical diagnoses
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Clinical interventions
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Clinical laboratory results
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Clinical radiographic information
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Readmission to hospital
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Other hospitalizations post-discharge
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Infant characteristics
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Demographic (sex, birth date, race, ethnicity) information
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Current weight
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Current length
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Perceived overall health and functioning
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Influenza vaccination status (from vaccination cards when available)
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Delivery characteristics (including gestational age, birth weight, complications and abnormalities)
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Diagnoses and history of care for chronic conditions
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Diagnoses and history of care for prior acute illnesses
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Results of previous laboratory tests
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Other immunization status
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Daycare attendance
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Household characteristics
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Age of each household member
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Education and occupation of parents (or guardians)
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House size and number of rooms
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Subjective social status
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Household wealth index
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Household smoking
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Maternal characteristics
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Subjective health status
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Medical conditions
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Pregnancy history and complications during study infant’s gestation
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History of and current breastfeeding
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Influenza vaccination status (from vaccination cards when available)
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Knowledge of and worry about influenza illness
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Knowledge of and attitudes toward influenza vaccine for infants aged ≥6 months
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