Fewer than 2% of eligible Americans have elected to receive a new COVID booster shot, according to CDC data.

While more than 4.4 million Americans have received a “bivalent” COVID booster shot, only 1.5% of people for whom the shot is available have actually gotten it since the CDC started recommending it several weeks ago. The latest COVID vaccine booster is designed with Omicron sub-variants BA.4 and BA.5 in mind.

The CDC’s COVID vaccine tracker shows that 67.8% of the U.S. population who are eligible for the vaccine have completed the primary series of shots. The Bloomberg tracker shows that 32.5% have received at least one booster.