Virus or allergy?: Probably the antibiotic didn't work because you have had a viral infection or allergy. Group B strep (GBS) is a normal bacteria that usually doesn't cause symptoms. It probably was appropriate and cautious for your doctor to treat you with amoxicillin when the culture showed GBS, but only as a precaution. Your sore throat probably will continue to gradually improve. Re-check w/ doc if it doesn't.
Answered 3/22/2020
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Have recheck: Persistent sore throat can have many causes. Post nasal drip from allergies or a sinus infection; sore throat due to reflux which can often be silent; viral infections, and other causes. See your provider again if the throat does not improve. Happy healing.
Answered 10/23/2017
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