Published data from Pfizer says that short term efficacy between dose one and two is 52.4%. The UK’s Joint Committee on Vaccination and Immunisation has said that short-term efficacy from the first dose of the Pfizer-BioNTech vaccine is calculated at around 90%. Immunity provided by the Pfizer/BioNTech vaccine reaches its full effect seven days after the second dose. However, long term efficacy is unknown. We will know how long the immunity produced by the vaccine lasts as more data is collected. However, it is too early to know if whether this is a one-off injection or an annual one, like that for the ‘flu.
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