How long will your COVID-19 vaccine last? And will you need a booster?

"We believe, sooner or later, you will need a booster for durability of protection," Dr. Anthony Fauci said.

The Food and Drug Administration and Centers for Disease Control and Prevention are expected to greenlight booster shots for immune-compromised individuals this week, after mounting evidence reveals they may not reach full protection with their original vaccinations. But this expanded authorization only will apply to this very narrow group. For the rest of Americans, currently available data suggests all three authorized vaccines are offering good protection at least six months after initial vaccination -- likely even longer. "We believe sooner or later you will need a booster for durability of protection," said Dr. Anthony Fauci, speaking at Thursday's White House press briefing. "We do not believe that others, elderly or non-elderly, who are not immunocompromised, need a vaccine [booster] right at this moment." "We are evaluating this on a day-by-day, week-by-week, month-by-month basis," Fauci added. "So, if the data shows us that, in fact, we do need to do that, we'll be very ready to do it and do it expeditiously."