Dear {Name},
I am so terribly sorry that you contracted {virus/infection/disease} via your contact with me. I didn't even know that I {had the disease/was contagious}. Please believe that I never would have exposed you intentionally.
I hope that you aren't suffering too badly. If there's anything I can do, please let me know. It's not much, but I've enclosed a gift card for {food delivery/etc.}.
I feel just awful for giving you this. Please get well soon. If you feel up to it, let me know how you're getting along.
Sincerely,
{Name}
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