President Biden announced on Tuesday that he anticipates the U.S. will have enough supply of COVID-19 vaccine to inoculate every American adult by the end of May. The timeline is shortened from the administration's previous pledge to have enough doses for every adult by the end of July. However, it's not clear that every U.S. adult who wants a coronavirus vaccine will be able to actually get a shot that soon — in addition to supply, the vaccine rollout has also suffered from a lack of resources to increase the number of vaccinators and vaccination sites. Biden directed states to start vaccinating all teachers and school employees by the end of March. The increased supply comes as a result of an agreement by drug maker Merck to produce the newly-authorized Johnson & Johnson vaccine.

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