pfizer suggests seven days after a pfizer suggests seven days after a pfizer booster it is extremely effective at preventing illness, was the first uk world study found the protections were very high after 1a days. so yes, he has answered his own question, there is a quicker response to the ban to the first and second doses. response to the ban to the first and second doses-— response to the ban to the first and second doses. andrew asks, dr sarah pitt, by shortening — second doses. andrew asks, dr sarah pitt, by shortening the _ second doses. andrew asks, dr sarah pitt, by shortening the time - second doses. andrew asks, dr sarah pitt, by shortening the time between| pitt, by shortening the time between the second vaccine at the booster, can you be over vaccinated, no, i don't think there is any real risk of that. ~ , don't think there is any real risk of that. ~ ., ., �* ~ ., don't think there is any real risk ofthat. ., ., �* ~ ., , don't think there is any real risk ofthat. ., ~ ., , ., of that. what we don't know is how lona that, of that. what we don't know is how long that. that _ of that. what we don't know is how long that, that immunity _ of that. what we don't know is how long that, that immunity cover- of that. what we don't know is how long that, that immunity cover the | long that, that immunity cover the vaccine _ long that, that immunity cover the vaccine gives you lasts for. it might— vaccine gives you lasts for. it might be _ vaccine gives you lasts for. it might be that it only lasts for three — might be that it only lasts for three months or six months, whereas perhaps— three months or six months, whereas perhaps if— three months or six months, whereas perhaps if you had had longer intervals— perhaps if you had had longer intervals between the doses it might have lasted eight months or something like that. we don't know for sure _ something like that. we don't know for sure and — something like that. we don't know for sure and because they are all new vaccines and these are all new vaccination — new vaccines and these are all new vaccination schedules, if you like, but the _ vaccination schedules, if you like,