[Bacterial pollution with Campylobacter in surface waters of water-plants after different steps of water processing]. / Zanieczyszczenie bakteriami z rodzaju Campylobacter wód powierzchniowych ujmowanych dla celów wodociagowych i po róznych etapach ich uzdatniania.

The presence of bacteria of Campylobacter genus was investigated in 55 samples of surface water taken from Vistula river nearby Warsaw, and from different stages of water processing plants in Central and Northern water plants. For this purpose the membrane filters technique in microaerophilic conditions and differential medium with the antibiotics addition were used. Bacteria of Campylobacter genus were detected in 36% samples of surface waters and positive correlation with the contamination with coli of fecal type bacteria was found. The presence of Campylobacter was also found in water intakes in Central and Northern water plants and in water samples taken from sediment trap after fast filters and coagulation in Central water plants. No Campylobacter type bacteria were found in chlorinated water containing of free chlorine in concentration of 0.66 mg Cl2/l.

[Occurrence of bacteria of the Yersinia genus in surface water]. / Wystepowanie bakterii z rodzaju Yersinia w wodach powierzchniowych.

The aim of the study was determination of the frequency of occurrence of Yersinia genus bacteria in surface waters polluted to various degrees with bacteria of the coliform and of fecal coli. For detection of Yersinia rods the previously elaborated medium Endo MLCe and the membrane filter method were applied. Samples of 42 surface waters were examined, including 26 from rivers and 16 from lakes, ponds and clay-pits. On the basis of sanitary bacteriological analysis 16 surface waters were classified to class I purity, 10 to class II, the remaining ones to class III or beyond classification. Yersinia rods were detected in 15 water bodies that is 35.7% of the examined waters. A total of 27 Yersinia strains were identified with dominance of Y. intermedia (14 strains) and Y. enterocolitica (10 strains). Three strains represented by the species Yersinia frederiksenii. Most of the Y. enterocolitica strains belonged to biotype 1, the particular strains being represented by various serotypes. Hence their different origin may be concluded. The pathogenic serotypes 0:3 and 0:9 of Yersinia enterocolitica were not detected.