Abstract
The capability of the enteropathogenic Yersinia enterocolitica 8081 bio/serotype 1B/O:8 to form binary and multi-species biofilms with defined bacterial strains was studied. The interspecies interactions in the binary biofilms of the enteropathogen with three bacterial isolates from drinking water and water-associated biofilms were assessed. The effect of each individual partner strain for the Y. enterocolitica involvement in the four-species bacterial biofilm was evaluated by excluding one by one the isolates from the sessile community. It was found out that Y. enterocolitica and the tested bacterial strains interact each other in the binary biofilm formation. Moreover, the Y. enterocolitica involvement in the biofilms depends on the partner strain. In the multi-species biofilms, a synergetic effect of one of the bacterial partner strains on the Y. enterocolitica attachment was detected in contrast to the weak inhibitory effect of another one.
Highlights
Drinking water purification processes have received their optimal technological solutions, but bacterial regrowth and biofilm formation occur in drinking water supply systems (DWSS) regardless of a residual disinfectant in water
The present study aims at claryfying the integration of Yersinia enterocolitica 8081 bio/serotype 1B/O:8 into binary and multi-species biofilms with defined species composition, as well as to evaluate the pathogen interactions with the individual bacterial partners, taking part in building of the biofilm community
The data show that the number of Y. enterocolitica in all binary biofilms was greater than its single-species biofilm
Summary
Drinking water purification processes have received their optimal technological solutions, but bacterial regrowth and biofilm formation occur in drinking water supply systems (DWSS) regardless of a residual disinfectant in water (most often active chlorine). Specific microenvironments in the biofilm structure create conditions for recovery of bacteria injured through disinfection, ensure niches for survival or proliferation of water-borne pathogens and protection against predators and environmental stress, as well [4, 8, 9]. In this way, drinking water-associated biofilms can act as a reservoir of bacteria, including pathogenic ones, promoting bacterial contamination of drinking water, which in turn can create a health risk for water consumers and cause social and economic damages [4, 9]. The data on planktonic growth and potential of the individual bacterial species to form single-species biofilms in drinking water cannot be extrapolated to multi-species biofilm community [13]
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