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We undertook systematic reviews to examine key questions (KQs) related to pediatric chronic wet cough. In children with chronic (>4-weeks) wet/productive cough not related to bronchiectasis; (KQ1)-how effective are antibiotics in improving the resolution of cough? If so, what and for how long? and; (KQ2)-when should they be referred for further investigations? ⋯ There is high quality evidence that in children aged ≤14-years with chronic (>4-weeks duration) wet or productive cough, the use of appropriate antibiotics improves cough resolution. There is also high quality evidence that when specific cough pointers (e.g. digital clubbing) are present in children with wet cough, further investigations (e.g. flexible bronchoscopy, chest CTs and immunity tests) should be undertaken. When the wet cough does not improve by 4-weeks of antibiotics, there is moderate quality evidence that children should be referred to a major center for consideration of further investigations to determine whether an underlying lung or other disease are present.