He made a magical Christmas mask just for this occasion, that blocks out the coronavirus. Its made out of Christmas magic, but he has just enough for the sleigh and the mask, which is why he can’t give anyone else a mask.
Remember in The Princess Bride when Wesley subjects himself to minute doses of poison for years, thus building a tolerance? Well, rather ghoulishly, Santa has eaten nothing but a diet of the raw bat for years, so he is quite impervious to the ravages of the virus.
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