lol there's no risk there really, but that is absolutely hilarious to find. That was how they helped with vaccination back then, sharing scabs/scab powders etc. They would rub the powder in superficial scratches, some would snort it/blow it up their noses. 🤢 It worked though, started saving a lot.
Ada PalmerHistorian friend was reading a civil war era letter in an archive, the letter said “In this envelope I include my smallpox scabs” and sure enough there they were. Had to call CDC for a hazmat team.