Maybe in addition to offering immunity to covid-19 it also changes your immune response to a type of cancer cell. Then it's found that people with this change a

Maybe in addition to offering immunity to covid-19 it also changes your immune response to a type of cancer cell. Then it's found that people with this change almost always suffer from the same type of cancer. Some viruses are known to cause: https://en.wikipedia.org/wiki/Infectious_causes_of_cancer#Viruses https://en.wikipedia.org/wiki/Infectious_causes_of_cancer#Vi... Right now our best guess is these vaccines are safe but there is no guarantee of that.