There have been a few cases. However we think we understand why they happened and so it won't. Anything is possible.

If you are a doctor/nurse working in a covid ward we know for sure that the risk whatever happens long term is a lot less than the risk of getting covid. For someone like me who has no reason to go anywhere (I'm not even allowed in the office until this pandemic passes) I can afford to wait until there is more data - and I also have to because I'm low on the list of those who will be vaccinated because I'm relatively low risk of getting it.