Differentiating viral and bacterial pharyngitis - #10263

Mr AB 23-year-old male patient came to GP with a complaint of fever for two days duration. He was apparent well until two days ago when he started to develop fever. The fever was acute in onset and with no chills or rigors. He developed a sore throat a day following the fever and fleeting joints pain. There were no other associated symptoms such as cough, runny nose, headache, diarrhoea or vomiting. Upon physical examination, the patient was well oriented, looked blushing, temperature was 38.5oC and rapid COVID19 test was negative. His vital signs were normal and no other abnormal findings except slight inflamed pharynx. Is this most likely viral or bacterial pharyngitis, explain why. Consider no blood test is done to confirm. Additional info, ptx relieve all symptoms on 3rd day, dr prescribed him with antipyretic, antiseptic gargles and amoxicillin.