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Appl. Environ. Microbiol., 04 1995, 1171-1179, Vol 61, No. 4
Copyright © 1995, American Society for Microbiology

Design and evaluation of Bacteroides DNA probes for the specific detection of human fecal pollution

CA Kreader
Microbiology Research Division, U.S. Environmental Protection Agency, Cincinnati, Ohio 45268, USA.

Because Bacteroides spp. are obligate anaerobes that dominate the human fecal flora, and because some species may live only in the human intestine, these bacteria might be useful to distinguish human from nonhuman sources of fecal pollution. To test this hypothesis, PCR primers specific for 16S rRNA gene sequences of Bacteroides distasonis, B. thetaiotaomicron, and B. vulgatus were designed. Hybridization with species-specific internal probes was used to detect the intended PCR products. Extracts from 66 known Bacteroides strains, representing 10 related species, were used to confirm the specificity of these PCR- hybridization assays. To test for specificity in feces, procedures were developed to prepare DNA of sufficient purity for PCR. Extracts of feces from 9 humans and 70 nonhumans (cats, dogs, cattle, hogs, horses, sheep, goats, and chickens) were each analyzed with and without an internal positive control to verify that PCR amplification was not inhibited by substances in the extract. In addition, serial dilutions from each extract that tested positive were assayed to estimate the relative abundance of target Bacteroides spp. in the sample. Depending on the primer-probe set used, either 78 or 67% of the human fecal extracts tested had high levels of target DNA. On the other hand, only 7 to 11% of the nonhuman extracts tested had similarly high levels of target DNA. An additional 12 to 20% of the nonhuman extracts had levels of target DNA that were 100- to 1,000-fold lower than those found in humans.(ABSTRACT TRUNCATED AT 250 WORDS)

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