Covid vaccine update: How long will a person’s immunity last? Expert weighs in

“It is certainly welcome news that the UK has approved the use of a third vaccine, developed by US company Moderna,” said Dr Morris.

“In total, the UK has now ordered over 350 million doses of the three approved vaccines, to immunise the population as quickly as possible.

“All COVID-19 vaccines require a second booster shot, but according to Public Health England, there is evidence that a longer interval between the first and second doses promotes a stronger immune response with the AstraZeneca vaccine.

“The health body also reported there is no reason to believe the immune response from the Pfizer vaccine will differ from that of AstraZeneca’s.

“With this in mind, the UK is pressing on with trying to give a first dose to as many people as possible.”

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