Re: how contagious tonsilitis is if you are on antibiotics.
Probably still contagious because tonsillitis is almost always caused by a virus, which of course is not susceptible to antibiotics. If it truly is a culture proven strep throat.....in terms of contagiousness, it's hard to determine because you can pass the bacteria on to someone else, but it doesn't mean that person will get a symptomatic infection.
Bottom line: cover your mouth when you cough or sneeze, and don't go to any hospital or be around any person with an impaired immune system 7 days from the point you first started feeling sick. That is for THEIR protection, not yours.