All of the COVID-related ones.
There are no known long-term side effects as these drugs that have been injected into humans are only a few years old at most.
According to Reuters [0] the trials are still ongoing. According to the UK government these vaccines were given out while still in trial [1] and some are ongoing.
Whether that's standard practice or not, they are still working out the long-term side-effects.
So what happens in 5 years? What data do we have on these? What happens if Alzheimers cases go through the roof in 5 years? Do we just throw our hands up and say, "Well, we never saw that coming!" By then there will be billions with the injections.
Vaccines take up to 10 years to make [2]. There is no possible way you can simulate the long-term side effects. None whatsoever. You need to observe people that have taken it for years! You also need a diverse group of people: female physiology can change dramatically based on age. Asians, white people and black people may react differently to the injections and so on... there is no long-term data on these injections! None!
[0] - https://www.reuters.com/article/uk-factcheck-vaccine-monitor...
[1] - https://post.parliament.uk/covid-19-vaccines-november-update...
[2] - https://news.ncsu.edu/2020/12/vaccine-manufacturing-q-and-a/