booster

In small studies in South Africa and in Germany, the results indicate a marked decrease in the ability of vaccines to neutralize this variant. But there are other findings that are encouraging.

The companies say a study of more than 10,000 volunteers showed a vaccine efficacy of 95% or greater for people receiving the booster.

The Food and Drug Administration recently approved COVID-19 vaccine booster shots for people with compromised immune systems. The shots may be more widely available soon.