4 of 12 Symptoms may begin 2-3 days after exposure to the virus. Flu comes on quickly and attacks the upper respiratory system. Other family members or close contacts often have a similar illness. In younger children, the pattern of influenza may be a typical influenza-like illness or look like other respiratory tract infections such as croup, bronchitis, or pneumonia. Abdominal pain, vomiting, and diarrhea are frequently observed in children.
Vomiting tends to be more significant than diarrhea.
In infants, flu often goes unrecognized because the signs and symptoms are not specific and may suggest a bacterial problem. Influenza does not commonly occur in infants because they still have antibody protection from their mothers. HOME CARE Section 5 of 12 Flu symptoms may last over a week. Caregivers can relieve and soothe children s aches and pains with basic home care. Rest in bed.