In order to test if the intestinal bacteria play an
important role in antibacterial ability of earthworm, we chose Escherichia
anthropozoonosis pathogen, as a biological stressor and studied the change of intestinal bacteria community of earthworm by
PCR-DGGE analysis. Results showed that the pathogen merely existed 1 - 3 days,
then almost disappeared after through the earthworm’s gut. In this period, the
diversity and abundance index of intestinal bacteria increased first, then
decreased, and finally kept stably after 7
days. The result demonstrated that the intestinal bacteria of earthworm
had ability of adjust community structure to eliminate the pathogen E. coli O157:H7, and the amount of bacteria Bacillus increased significantly,
which might be the positive antagonism to E. coli O157:H7.
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