you should not be able to get strep while on amoxicillin since this drug is used for strep. you can however get a viral sore throat or even mono while taking antibiotics.
can you be reinfected with strep while in the middle of treatment? . i had strep throat two weeks ago. the practitioner gave me penicillin for it the strep cleared up but two days after completing my course of antibiotics i had a recurrence i'm now half way through my second course of antibiotics (this time amoxacillin) and i noticed a slight tingle in my throat this morning. a scratchy throat very well could be an affect of my seasonal allergies (it's not uncommon for me to become congested with a scratchy throat this time of year).