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that's when the country could see enough vaccine for all american adults. and by the end of july, moderna and pfizer will deliver the last of their 600 million doses, which would mean a surplus. >> we're going to use every conceivable way to expand manufacturing of the vaccine. the third vaccine, to make even more rapid progress in getting shots in people's arms. >> reporter: but today some health officials concerned about the variants, noting the recent plunge in cases may be stalling with an uptick in the last three days. >> the latest data suggests that these declines may be stalling, potentially leveling off at still a very high number. we at cdc consider this a very concerning shift in the trajectory. >> reporter: still, the race to vaccinate is picking up steam. the 101st airborne division deploying to orlando to support vaccination efforts there. and those shipments delayed by the storm now flowing in the northeast. new york adding overnight shifts at mass vaccination sites after getting extra supply.