The U.S. faces a surge in COVID, flu, norovirus, and RSV infections post-holidays, with experts predicting worse as flu season peaks. Norovirus cases hit record highs since 2012, while RSV hospitalizations rose 40% in two weeks.

Flu has already infected 3 million, causing 37,000 hospitalizations and 1,500 deaths. Hospitals in states like California and Illinois have reactivated emergency protocols. New York officials urge mask use in crowded areas to combat the spread.