I do appreciate that. I should have been clearer that by 'pro-active' I did not mean being quicker to act on those subsequent posts. My point was rather that whatever action was taken at the time the first post was deleted, evidently it was insufficient to deter the poster from doubling down and effectively posting the same statement and following up with a couple of other completely untrue statements about the vaccine. Maybe that particular individual would not have been deterred by any warning, but my perception is that this pattern has been repeated by others who are/were relatively new members and joined the forum during the pandemic.
So maybe whatever warnings you and the other moderators are giving when you delete the first such post by relatively new members are insufficient, and maybe a blunter first and final warning might be a more effective deterrent.
Moreover, since it seems more likely to be new members who do this, it might help if a prominent warning about posting untrue/misleading statement about Covid and vaccines, and the penalty for doing so, were displayed when registering. That itself might not deter, but it would mean that posters have been given very fair and very explicit warning before their first breach, which should reduce the subsequent need to explain and give further warnings. I appreciate that amending the registration page to do that would be more work for admin, but it might save trouble in the long run since current predictions suggest the pandemic is likely to last at least another year and possibly significantly longer (https://inews.co.uk/news/politics/covid ... ts-1297889).