This report summarizes the published evidence on the diagnosis & treatment of community-acquired acute bacterial rhinosinusitis in children & adults. The performance of diagnostic tests & the efficacy of antibiotics & ancillary treatments were assessed. Human studies of sinusitis were identified from MEDLINE (1966 to May 1998), technical experts, & bibliographies. Acute bacterial rhinosinusitis was defined as bacterial infection of the paranasal sinuses & symptoms lasting up to 4 weeks. Only diagnostic studies that compared two or more tests were used. Only randomized controlled trials were used to assess treatment efficacy. Studies that met methodologic quality criteria were used in meta-analyses. Charts & tables.Lau, Joseph is the author of 'Diagnosis and Treatment of Acute Bacterial Rhinosinusitis' with ISBN 9780756731571 and ISBN 0756731577.