The fimbriated adhesines constitute a factor of virulence of E. coli in the urinary tract infections. The presence of type 1 fimbriae and fimbriae P was evaluated in 23 E. coli strains isolated with patients with chronic bacterial prostatitis. For the diagnosis of prostatitis the Stamey test was used. The detection of the type 1 fimbriae was carried out by agglutination of the E. coli strains with Saccharomyces cerevisiae and that of fimbriae P with PPA test. 95.7% of the evaluated strains had type 1 fimbriae and 52.2% had fimbriae P. It is concluded that type 1 fimbriae are common in all strains associated with urinary tract infection, without any relationship between their presence and the localization of infection, and that the presence of fimbriae P is not a constant feature of the E. coli strains associated with chronic prostatitis.