Move to postpone second jab by up to 12 weeks is not supported by scientific evidence, experts find
There is no scientific evidence for a delay of more than six weeks in administering the second dose of the Pfizer/BioNTech vaccine against Covid, say experts from the World Health Organization.
The UK is planning to postpone giving the second dose of both the Pfizer/BioNTech and the Oxford/AstraZeneca vaccines by up to 12 weeks – twice the length of time for which there is data, according to the WHO.
