If you suspect it
You need a throat culture
with "chocolate agar", because one cannot tell clinically if it's gc or any other sore throat
), but you need to know precisely so that the treatment is correct - routine oran ab's may not do the trick.
It's embarassaing, but letting it get worse can lead to systemic spread to joints, meninges, so find out. Dr. Wainscoat describes well.