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Several scientists in both the My hair is black history shirt 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.Delaying second doses is a wager that, in the setting of such severe shortages and limited data, getting more people partially immunized quickly will have better outcomes compared to getting fewer people immunized fully.
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