The U.S. donation from its domestic supplies comes on top of the 50 million doses previously donated to Africa, which world health officials say is 500 million doses short of its goal.
The COVID-19 vaccines continue to provide powerful protection, even against the delta variant, the CDC said. It also found that vaccinated people were 10 times less likely to be hospitalized.
While emphasizing that the risk is low, the health agency said there should be a warning about the rare condition included in the product information for the vaccine.
An expert advisory committee to the CDC decided it needed more time to consider whether to recommend the restart administration of the COVID-19 vaccine made by Johnson & Johnson.
Soon after U.S. regulators paused the use of the J&J single-dose vaccine, health authorities in many European countries and in South Africa announced that they were also putting it on hold.
As the new Johnson & Johnson COVID-19 vaccine rolls out, the health care community is trying to ward off misconceptions about it. The vaccine's one-shot feature may be what wins many over.
U.S. Catholic bishops say the Pfizer and Moderna vaccines did not use abortion-derived fetal cell lines, but that the Johnson & Johnson vaccine is acceptable, if it's the only available option.