Pfizer says supply chain challenges contributed to slashed target for COVID-19 vaccine doses in 2020

Pfizer has said in recent weeks that it anticipates producing 50 million doses of its COVID-19 vaccine this year. That is down from an earlier target of 100 million doses. Pfizer#39;s vaccine relies on a two dose regimen, meaning 50 million doses is enough to inoculate 25 million people.

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