[Bacteriophage types of staphylococcus aureus in neonatal wards of hospitals in Gdansk region during the years 1984-1991].

Investigated 3558 strains of S. aureus were obtained from healthy newborn infants in neonatal wards. The staphylococci were classified as S. aureus on the basis of a positive coagulase test. Bacteriophage typing was performed with a basic set of phages and an additional phage (187), according to the method Blair and Williams, in RTD and RTD x 100. Additionally, susceptibility of staphylococcal phagotypes isolated in the years 1988-1991 to antibiotic from penicillin and cephalosporin groups, trimethoprim-sulphamethoxazole, erythromycin, lincomycin and doxycycline, was determined by disc diffusion method. Among tested strains phagotypes of group II dominated. They constituted 31.3% of all present phagotypes. Second in frequency were phagotypes of group V and III (13.2% and 10.0%). Large number of staphylococci (22.9%) was typable at the same time with phages belonging to different phage groups. Tested staphylococci were highly resistant to penicillin (98.8%), ampicillin (98.9%), cloxacillin (38.6%), carbenicillin (32.6%) and doxycycline (45.6%).