By Carl O'Donnell and Michael Erman (Reuters) - The U.S. government has hit the accelerator on its shipments of COVID-19 vaccines after a month of largely stagnant weekly deliveries, giving states the doses they say they need to finish vaccinating priority groups and open shots to all adults in the coming weeks. The biggest supply boost has come from Johnson & Johnson. Shipments of the one-shot vaccine had been slow to ramp up since its late February authorization as the company waited for regulatory clearance of a key U.S. factory. Pfizer Inc also has boosted output of its vaccine, doubling b...
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