2024 Flu Symptoms And Duration Of Symptoms. Rarely, it can also cause severe. The flu is the only respiratory virus that causes abrupt.
Learn how to recognize the signs and symptoms of influenza (flu), a contagious respiratory illness that can cause fever, cough, sore throat, and more. The flu vaccine cannot give you the flu, but it may cause some mild side effects like headache, fatigue or arm soreness.
