H1n1 2025 Symptoms

H1n1 2025 Symptoms. Flu can cause mild to severe illness, and at times can lead to death. Your child's risk for severe symptoms is higher if he or she is younger than 5 years.

H1n1 influenza infections can cause symptoms such as rhinorrhea, rigors, myalgia, headache, fever, chills, loss of appetite, and, possibly, lower respiratory tract disease and gastrointestinal disease. Your child’s risk for severe symptoms is higher if he or she is younger than 5 years.