Thanks for your question on Health Care Magic. I can understand your son s situation and problem. In my opinion, you should consult pulmonologist and get done clinical examination of respiratory system and chest x ray. He is having cough, fever (not improving with Biaxin) , lethargy, weakness etc. So possibility of lung Infection (pneumonia) is more. And so chest x ray is needed for the diagnosis of pneumonia. He may need additional higher antibiotics, anti histamine and anti inflammatory drugs. Ask him to drink plenty of fluids orally and keep himself hydrated. Don t worry, he will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.