Infectious Disease Specialist Questions Strep Throat

How long is strep throat contagious for?

My son has strep throat and now he's on antibiotics for it. I pulled him out of school but I don't want him to go back if he's still contagious. How long will he be contagious for?

3 Answers

You should be fine not being contagious after 24 hrs of proper antibiotic treatment. If you don’t seek treatment, you can be contagious for 2 to 3 weeks after contracting the infection.
Strep throat is contagious for about 2-3 weeks in individuals that do not take antibiotics. However, individuals that take antibiotics for strep throat usually are no longer contagious about 24 hours after initiating antibiotic therapy.
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He is okay to go back to school after he has been on antibiotics for 24 hours.

Randall Fisher, M.D.