https://apnews.com/b9e3e910d0e0f0b696a7c7c278287be9

The first Americans vaccinated against COVID-19 are getting their second dose, while Britain has decided to postpone boosters and focus instead on giving more people a first shot — international differences that are adding to public confusion.

There's growing debate about whether to change vaccine dosing methods — the time between shots or even the amount in each shot — to stretch scarce supplies and possibly get more people inoculated faster. But the U.S. made clear late Monday that none of those strategies are on the table — because there's no science backing them.