Start with strengthening the immune system. Antibiotics will not help if it is Viral -and they don’t often bother to check. If they aren’t taking probiotics daily, add them in -MightyPro is great for kids, and Essentialzyme. PhytoNutrition would be great too. Immupro before bed and make sure you are diffusing lung support oils in their rooms at night and applying constantly. Nebulize with saline solution and food grade hydrogen peroxide for the really tough cases.