During the period 1.XI.1985-20.III.1986 all patients attending the venereal disease (VD) in Maniitsoq Sukkertoppen, Greenland were examined for gonorrhoea according to general routines in Greenland supplemented with procedures for identification of chlamydia trachomatis (CT) infections including culture on McCoysells and identification by FITC-labelled monoclonale antibodies, both performed by Statens Seruminstitute in Copenhagen. 261 patients were examined. Prevalence of gonorrhoea was 0.33 and of CT infections 0.34. Two thirds of female CT infections were found in ages below 20 years and practically all cases below 25. In males two thirds were younger than 25 years, and it was noticed that gonorrhoea was more prevalence than CT infections. Diagnostic problems arose in 1/3 of cases with mixed infections. Identification techniques for CT infections are difficult to perform in Greenland, so other diagnostic tests are needed. Finally it is recommendable to introduce a standard treatment in Greenland, covering gonorrhea as well as CT infections.