Michael Davis, MD, pediatrician, discusses swine flu in children. Influenza A (strain H1N1) infection is now a worldwide pandemic. Symptoms include high fever, malaise (feeling tired and sick), chills, headache, cough, muscle aches, and runny nose. You should see a doctor if there are severe, persistent symptoms, rash, child not drinking, decreased urine output, excessive sleepiness, blood in vomit or stools.