@Mammmood - The problem with strep throat symptoms is that they are very similar to symptoms of a common sore throat viral infection. In both cases you have a sore throat with a fever.
This was the case with one of my kids—he was initially misdiagnosed as just having a sore throat and given the appropriate medication.
It was only a few days later, after the swollen lymph nodes showed up along with white spots on his tongue, that the doctors determined it was strep throat and put him on antibiotics.
Unfortunately, the price you pay for having the wrong diagnosis from the beginning is lingering symptoms.