Missing the second dose of the vaccine lowers protection against the virus. Two doses are required for the vaccine to reach its maximum efficacy of 95%. There is currently no information available regarding how much delaying the second dose could reduce the vaccine’s efficacy. The recommended timeline for receiving the second dose of Pfizer is 21 days after the first dose. For Moderna, the recommended timeline is 28 days after the first dose. Efficacy of the vaccine after the recommended amount of days after the first dose was not specifically studied in trials.
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