3yrs boy gets dry cough every month for 10 days, then 39c fever, phlegm, then chesty cough. flu panel neg on all occasions, rsv pos only once. allergy panel neg. chest x-ray clear. lungs always clear. what reasons for 12 upp respi infections a year?

3 yo w/ URTIs: In a 3 yo with recurrent infections would consider allergies, asthma,mycoplasma infection, reflux, sinusitis ( due to environmental /food allergies often milk) immune disorder- a variant of primary immune deficiency, cystic fibrosis( usually though would have abnormal CXR), f/u/ w/ allergist

More evaluation: is needed for your son preferably by an Allergist/Immunologist,if you have access to one. A negative allergy panel doesn't mean that the patient isn't atopic (has allergies),it depends on what was included in the panel.might not concur with the actual environment the patient lives in.12 URIs /year are pretty much,we don't know if it is partially treated sinusitis vs true immunity problem,goodluck

Many possibilities: Your child should have a test for cystic fibrosis. If that is negative, then I recommend he be tested for an immune deficit with quantitative immunoglobulins and IgG subsets as well as IgE level. Has he had a test for tuberculosis? Is he exposed to anyone who smokes? Is he exposed to interior fumes of any type? Consider scheduling a visit with one of our providers for an in depth assessment.