I decided to no longer post here, I sometimes read. However I am going to make one exception and say that what I learnt last time someone decided to behave like a troll and derail a thread was that you should report each and every post that breaches mumsnet guidelines.
The person behaving like a troll made more than one mistake. Vaccine combination trials are underway. The vector used for Oxford is not one anyone is expected to react to but that is why we have clinical trials, it has been tested. Clearly the troll is ill-informed and not a suitable person to listen to on vaccines or anything else, since they have shown so little sense on this.
Maybe they have shares in a different vaccine, maybe they are just an attention seeking idiot. Either way they are best reported and ignored.