Strep throat is very contagious but not after 48 hours after antibiotic treatment has been started so I advice you stay at home just one day more and so you won't be a threat for your friend's kids. It is more likely you have had some bacterial throat infection for you are taking antibiotics and those sort of strep infections are easily to spread so basically are very contagious and could cause some more severe complications such as
joint paint and muscle weakness but also ear infections or
rheumatic fever so it is for sure that at this stage your strep throat is contagious within at least next 24 hours.
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