My 5 year old son has had a series of Strep throat. He was give Amoxicillin for the first 2 which occured within a month of each other and did not clear. He has had a wet cough for 2 weeks now and when I took him in to see the doctor, they said his oxygen level was 100%, but a throat culture confirmed he had strep throat again. She changed his antibiotic to Cephalaxin, but did say that this should not be coughing the cough, although she could not explain the cough. I'm worried, becase we were remodelling last month and I don't know if he inhaled some old paint dust (possible lead paint), hence the cough.