Lymphadenitis

This observational study aims to learn more about complicated infections treated by otorhinolaryngologists. The main questions to answer are: * What is the management of complicated sinonasal infections in Ljubljana, Slovenia, * What is the management of complicated ear and temporal bone infections in Ljubljana, Slovenia, * What is the management of complicated neck soft tissue infections in Ljubljana, Slovenia, * What is the management of complicated laryngeal infections in Ljubljana, Slovenia Participants will receive standard treatment according to the established evidence-based clinical practice.

The aim of the StopStop@HITH study is to see if stopping antibiotics when symptoms stop is as good as finishing the course of antibiotics. The study will enrol children at the Royal Children's Hospital who are prescribed oral antibiotics after completing a course of intravenous (IV) antibiotics for the treatment of cellulitis, urinary tract infection (UTI), lower respiratory tract infection (LRTI) and lymphadenitis. The aims of the study are: * To determine if oral antibiotics can be safely stopped once symptoms stop in children with cellulitis (who have completed a course of IV antibiotics). * To assess feasibility of a larger study of other common infections across multiple hospitals. The participants parent/guardian will complete a daily symptom tracker for the duration of the prescribed oral antibiotic course and attend a telehealth appointment with the study team once the participants symptoms have resolved. There are additional follow up surveys at day 14, day 28 and day 180.