Seasonal influenza tends to target young children and older adults.

People who live in facilities along with many other residents, such as nursing homes or military barracks, are more likely to develop influenza.

Cancer treatments, anti-rejection drugs, corticosteroids and HIV/AIDS can weaken your immune system.

People who have the flu often experience Fever Feeling feverish/chills Cough Sore throat Runny or stuffy nose Muscle aches Headaches Fatigue (tiredness) Vomiting and diarrhea (more common in children than adults)

In children

Fast breathing or trouble breathing Bluish skin color Not drinking enough fluids Not waking up or not interacting Irritability even when being held Improvement of flu-like symptoms followed by return of symptoms with fever and worse cough Fever with a rash