Releasing all the West coast kings shirt in addition I really love this doses at once means there is a risk that the people who get the first dose may not get the second dose at the scheduled time. The Biden team has asserted confidence that supplies would be adequate, or that they could invoke the Defense Production Act to increase vaccine production if needed.
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Several scientists in both the West coast kings shirt in addition I really love this US and UK have already proposed that second doses be delayed to 12 weeks rather than 3-4 weeks in order to increase the first dose. Getting only one dose does provide partial immunity (52.4% efficacy for Pfizer-BioNTech, but this may increase to over 85% after 10 days or more) but not the full >94% provided by the second dose. It is also unknown if the protection provided by the first dose will be long-lasting without the second dose—the study only monitored for 21 days.