Is it possible that you are more likely to get the Coronavirus if you had previously gotten the flu shot?
Think about who is most likely to get flu shots. Older people. People with predisposed conditions. Etc.
Maybe it is worse if you have multiple years worth of flu shots, thus children are less likely to be effected by the Coronavirus.
Related:
https://twitter.com/TammyParry/status/1243386433043173380