It appears that it may be causing strokes.
“Safety signals do not indicate proof that vaccines are causing a problem, but they are evidence that there is a possible correlation between the events and the vaccine…
The “safety signal” appeared in November and they are just revealing this now. They claim they are being transparent, but this is a bad sign. The WaPo downplays this, saying that they were looking into it and data doesn’t confirm the signal, but the CDC itself says they are still studying the matter.”