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More than a billion people around the world have been waiting for the Johnson & Johnson vaccine — a cheap, easy-to-transport, one-dose injection to reduce the risk of COVID-19.

Now the global rollout has been thrown into doubt.

The U.S. Food and Drug Administration, which this week recommended use of the vaccine be paused while scientists study a possible link to extremely rare blood clots, has no authority outside the United States. But many countries follow its lead.

The fallout has already started in South Africa, where authorities also paused use of the vaccine, which was the only one available there. In February, the country scuttled plans to use AstraZeneca’s vaccine, which tested poorly against the coronavirus variant that is dominant there and has also been linked to blood clots.

Read the full story at LATimes.com