Different pathogenic bacteria appeared capable of survival in groundwater longer than 100 days, and perhaps, they can be transported for distances from the site of contamination. Their elimination by a predator such as Bdellovibrio sp., seems to fail under an ambient temperature of about 10 °C. Also in model groundwater microcosms, bacteria bearing either natural or recombinant plasmids appeared detectable for up to 150 days, and the expression of plasmids remained stable. The survival of all bacteria under testing, however, was evidently handicapped in non-autoclaved groundwater samples, i.e., those containing natural microbial population.
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