Dear {Name},
I'm so sorry but I have to miss rehearsal today. I am sick with a fever of {degrees} and the doctor informs me that I am contagious. I've already spoken with {Name} and {Name}, who are also in the scenes we need to run through.
I hope that we will be able to reschedule with the {choreographer/director/etc.}. I have received a prescription and should be OK to rehearse in {time period}.
With the performance coming up so soon, I understand if you'd like my understudy, {Name}, to step in. As you know, {he/she} can be reached at {contact}.
Sincerely,
{Name}
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