A survey of sexually transmitted diseases was attempted in Swaziland. Time and the terms of reference limited its scope, but much interesting information was gathered. Neither the prevalence nor the relative frequency of the different diseases in the community could be ascertained, but there was evidence to support the local impression that the sexually transmitted diseases present an increasing problem in Swaziland. An important problem was that of case finding and two aspects of this are stressed: (1) A general lack of knowledge concerning the venereal diseases; (2) The large number of men infected by 'casual' girl friends who cannot easily be traced, and who form a reservoir of infection in the community.