Hi, may I answer your health queries right now ? Please type your query here... I was diagnosed with strep throat and took cephalaxin for 10 days, then one week later my husband was diagnosed with strep and received antibiotics. A few days later I had a terrible sore throat and ear pain, so was prescribed another 10 days of Cephalaxin - 4 days into it I still have a terrible sore throat. Could I be immune to the Cephalexin and if so, would getting another strep test show if I still have it? We are leaving to travel out of the country in two days and I m not sure what to do.