BBCNEWS BBC News September 14, 2021 19:08:00
Winter particularly. officials today used this chart to show how effective vaccines are at preventing people with covid from needing hospital treatment. among those aged 65 and over, they were more than 90% effective up to nine weeks after a second dose. but they wane slightly the further away you got from that second jab. medical regulators said it was safe to use az, pfizer and moderna as boosterjabs, but thejcvi recommended pfizer or a half dose of moderna because they got the best immune res...
Source: archive.org