Is strep throat contagious after 3-4 days of antibiotics?
That depends on a couple things. Typically, after a person has been on antibiotics for 24-36 hours, their fever subsides and the antibiotic has killed most of the bacteria. At this point they are no longer contageous. If the sore throat wasn’t strep (say, if the doc didn’t culture it, and it was a viral sore throat) and if he has a fever, he could still be contageous. Not with strep, but with the virus, which you probably don’t want, either. If the sore throat was confirmed as strep (cultured by doc) and a fever is still present 36 hours after antibiotics, the infection might require a different antibiotic to fight it off. He would still be contageous, because he would still have an active infection. (and he should see his doc again) Find out if his fever is down/gone and if his throat is feeling better. If yes & yes – he’s ok.