Reservations that a vaccine looks like it has been produced in such a short space of time. The handling of the whole pandemic by those in power not filling anyone with any confidence.
You only have to have a look at how this country has handled it all, offering contracts out left, right and centre to their chums in dealing with it from the start. It's enough to make people just sit back and think "i'll just hang on and see how it plays out" and you don't have to be wearing a tin foil hat or believe the earth is flat to have reservations.
Chemotherapy to treat cancer has been in existence since the 1940's, we're talking 80 years of progress and 80 years of success stories.
If someone does not wish to be vaccinated, we shouldn't create a kind of poppy fascism towards them, everyone has a choice. If that is deemed to be a mistake then they should be treated in line with all other illnesses as that is what we all contribute towards to look after everyone.