The vaccines currently being rolled out across the U.S. offer strong protection. But new studies of experimental updates to the Moderna and Pfizer vaccines mark a critical first step toward an alternative if the virus eventually outsmarts today’s shots.

During the past two weeks, according to data compiled daily by UNICEF, fewer than 2 million COVAX doses were cleared for shipment to 92 countries in the developing world — the same amount injected in Britain alone.

The Indian Health Service announced this week it is shifting its vaccine distribution system to target individual hospitals and clinics with high demand for shots and taper supplies to hubs where most eligible patients have received doses.

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