How does a doctor verify if someone has strep throat and be certain that they have prescribed the correct antibiotic:

There are several signs which leads to the conclusion of
having strep throat, so, if occure the followings: swollen  and red tonsils and the
lymph nodes on the neck's sides, throat which is presenting red or white
patches,difficult swallowing, headaches and
stomachaches,fever,sick,nausea.

To establish the correct
diagnosis, not just one based on evidences, the doctor can test if it's strep throat, by
taking a sample of fluids, which collects them from the back of the throat and in about
5 minutes can find the result. If the result is a good one, despite obvious signs of
strep throat, the doctor could send the sample to the lab for a throat culture, which
will establish, in about 2 days, the proper diagnosis.