The main reason the surge is ebbing now, pandemic experts suspect, is the significant immunity many people in the U.S. have acquired from prior infections and COVID vaccinations many received.
The rate of new cases of COVID-19 among babies and children under 4 years old in the U.S. recently surpassed the rate of new cases among adults older than 65. Here's how to protect newborns.
Worries about waning immunity and talk of COVID booster shots has some Americans checking their antibody levels to see if they're protected. But scientists warn blood tests don't tell the full story.
