In the United States, flu season occurs in the fall and winter. While influenza viruses circulate year-round, most of the time flu activity peaks between December and February, but activity can last as late as May.
What does the study involve? >>>>>>>>>>>>>>>>>>>>>>>>>>>> Participants will be asked to make one visit to the National Institutes of Health (NIH) Clinical Center in Bethesda, Maryland, for a blood draw, medical history, and physical exam. If eligible for and interested in future studies, the participant will return to NIH and may need to stay in the inpatient unit.