Australia and other countries in the Southern Hemisphere just finished their easiest flu seasons on record, and the United States and other nations in the Northern Hemisphere could have an easy time, too -- if people get flu shots, practice social distancing and wear masks. "This could be one of the best flu seasons [we've had]," Dr. Robert Redfield, director of the US Centers for Disease Control and Prevention, told the Journal of the American Medical Association in August. "Particularly if [people] do one more thing, and that is to embrace the flu vaccine with confidence."