What are the arguments in favour of reducing the gap between doses of the Pfizer Covid-19 vaccine to 3-4 weeks?

Early on during the pandemic, the UK government took the decision to give second doses of the Pfizer Covid-19 vaccine after 12 weeks rather than the recommended 3-4 weeks. It has now reduced the gap to 8 weeks and is considering reducing the gap to 3-4 weeks. What are the arguments in favour of reducing the gap between doses to 3-4 weeks?

1. Giving the two doses of the Pfizer vaccine 3-4 weeks apart is in line with the manufacturer’s guidance.

2. This is what most other countries using the Pfizer vaccine are doing.

3. Evidence from randomised controlled trials and subsequent evidence from real-world data provides strong evidence that two doses of Pfizer vaccine given 3-4 weeks apart provide excellent protection against severe disease.

4. Data from PHE in England shows that two doses of vaccine provide much better protection against the delta variant than one dose. Hence, giving second doses after 3-4 weeks instead of after 8-12 weeks could help reduce the current ratee of infection in the UK

5. Many people are keen to get their second dose of Pfizer vaccine quickly because of concerns about other family members or to help them travel.

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