This has happened in the past a few times and it was so rare that it made national news and was talked about for decades after in the case of reggie lewis. A player, chris bosh, was forced to medically retire when he was a top 15 player for blood clots.
But at most this happened in the NBA once a decade. It will be interesting to see what happens going forward if they were really injected.
Jiri Fisher was a nhl player and went into cardiac arrest in the 90s or early 2000s as well. But that's it. Basically a handful of athletes over decades. Now that it's 2020/2021 it's a regular occurrence
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