 As per normal practice, patients will be switched to oral therapy after 2-4 days of IV antibiotics, when there is clinical improvement of the cellulitis. Based on the current prospective study, both HITH patients and ward patients are switched to oral antibiotics when there is a reduction in fever, swelling, erythema and improvement of function of affected area eg. Previously limping, now walking. Once changed to oral antibiotics as per RCH clinical practice guidelines; cephalexin 25mgkg 6 hourly, total dose may be combined and divided to twice daily, patients are usually discharged from hospital care and normally not followed up any further in hospital. In this study, the investigators are offering all participants a follow up in clinic 7-14 days by the RA who is a paediatric registrar after discharge from hospital. Parents will be requested to bring a stool sample from the patient to the clinic review but this is not mandatory. 