Seasonal Influenza
Between 5 and 20 percent of Americans will fall ill this year from seasonal influenza. Symptoms include fever, headache, extreme tiredness, dry cough, sore throat, runny or stuffy nose, muscle aches, nausea, vomiting, and diarrhea.
Your best defense against the flu is to have a flu vaccination each year, says Jill DeBoer, associate director of the University of Minnesota’s Center for Infectious Disease Research & Policy.

