This report reviews the epidemiology of outbreaks of infection due to SRSV's and offers practical guidance for the management of such outbreaks within hospitals. In principle, there are 3 points at which SRSV transmission may be controlled: the introduction of SRSVs into hospitals, control of transmission at ward level and prevention of spread to other areas. The basic principles underpinning the recommendations are also applicable to the management of outbreaks in some community-based institutions. Journal of Hospital Infection 2000;45:1-10.