Apology Letter For Spreading an Illness

Dear {Recipient},

My apologies for spreading the {flu/mumps/etc.} at our {workplace/school/etc.}. I thought I had already fully recovered—I was feeling good and really eager to get back to {work/class/etc.} after spending {number of} {days/weeks} {at home/in bed}. I should have waited a couple more days before returning.

I'm so sorry you got sick because of me. I hope you get well soon!

Sincerely,
{Your Name}

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