Prostatitis is usually more common after nongonococcal urethritis (NGU) than after gonococcal urethritis (King, 1964; British Medical3Journal, 1972; Schofield, 1972 (Pelouze, 1939; Blacldock, 1969;Meares, 1973), indicating the presence of prostatitis. At least thirty fields were examined before a specimen was regarded as normal.Received for publication January 1, 1974 Treatment was with erythromycin 250 mg. four times daily for 4 weeks and/or prostatic massage weekly for 4 weeks, but military duties prevented some patients from attending regularly for this.A group of patients with general medical conditions were also studied using the same methods. All were examined after holding their urine overnight.In view of the prostatic fluid findings among the patients treated for urethritis, data based on the same criteria were extracted retrospectively from the notes of patients seen personally who had acquired urethritis in Britain. The patients were soldiers attending the army clinic at the Royal Herbert Hospital, London. No details of defaulters from observation were available and treatment for gonorrhoea was Triplopen *penicillin 2-5 m.u. intramuscularly. In all other respects the management of these patients was the same. This group is not comparable with the patients studied in Singapore, but provides an indication of the incidence of post-urethritis prostatitis among soldiers in Britain.Results 338 British soldiers treated for urethritis in Singapore entered the study but, for the reasons shown in Table I, only 95 patients treated for gonorrhoea, 66 treated for NGU, and fifteen treated for gonorrhoea and post-gonococcal urethritis (PGU), completed the full investigations. *Triplopen 2.5 m.u. =benethamine penicillin 1 m.u., procaine penicillin 0.5 m.u., and sodium penicillin 1 m.u.