Research shows that the vaccines are losing some potency against milder infections, causing concern at the population level as data also suggest that people with breakthrough cases can effectively transmit the virus.

What he’s saying: “We’re already starting to see indications in some sectors about a diminution over time, that’s durability,” Fauci said.

“We don’t feel at this particular point, that apart from the immune compromised, we don’t feel we need to give boosters right now,” he added.

Fauci said that data is being followed “literally on a weekly and monthly basis” to determine how the level of protection is diminishing.