<s>[INST] Hi, I have a one year old son. He has had cough for 12 days. He took antibiotic but nothing changed. His doctor said that it might be a primary complex and needs to have x-ray to confirm. But my son had an x-ray 3 months ago. is it okay to have x-ray again? Thank you. [/INST] Hello. I just read through your question.Though we try to avoid doing xrays in any scenario, there are certain clinical scenarios where it is necessary. Often we can make a diagnosis based on history and physical exam, but sometimes we need the help of an xray to make a diagnosis. I agree </s>