Why the Flu Kills Young, Otherwise Healthy People

As one of the worst flu seasons in years continues to sicken people across the U.S., one of its most striking aspects are the untimely deaths it's caused: A 21-year-old bodybuilder; a 12-year-old boy; a 40-year-old marathoner. Infants, the elderly, and immunocompromised people are always at higher risk of dying from...