Daily US Covid-19 case and death totals are now about one-fifth of what they were during their winter peaks, and many experts attribute some of the slowdown to climbing vaccine numbers. Nearly 83% of Americans 65 and older have received at least one Covid-19 vaccine dose, and nearly 70% are fully vaccinated. Now, health and state leaders want younger people to take the plunge. To that end, the FDA is poised to authorize Pfizer/BioNTech's vaccine in children ages 12 to 15 by early next week.

