Throat pain, weakness. By any chance?

Hello Doctor, My Mother,70 yrs is having lot of pain in her throat since last 5 days and lot of weakness since 2 days. She is gargling with hot salt water and Betadine but no improvement. She is able to eat food properly just that she feels itching in the throat whole day and pain. She had urine infection in Feb, May and June(last 5 days) this year which is getting cured by medications. She is taking Norflox at present and the pain in urine has reduced. All blood tests and the reports are normal. She has BP and Diabetes. Takes Amlopres_5,Ecosprin-AV-75,Glycomet-500 S.R regularly. What type of medication (Antibiotics) or test is recommended? Could it be COVID19 by any chance? No fever no other symptoms of COVID. She also feels the taste of the food properly.