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United States Department of Agriculture

Agricultural Research Service


Location: Environmental Microbial & Food Safety Laboratory

2013 Annual Report

1a. Objectives (from AD-416):
The objectives of this research are three-fold: (i) to detect and quantify pathogenic Escherichia coli (e.g. E coli 0157) in the Anacostia River,(ii) to develop a fecal source tracking approach with respect to the upstream fecal contamination problem in the Anacostia River, and (iii) to monitor water quality on fecal coliform in the downstream portion of the Anacostia River.

1b. Approach (from AD-416):
Samples of the Anacostia River water will be obtained by the Anacostia Watershed Society (AWS) staff. These samples will be analyzed for pathogenic E. coli using immunological and genetic methods previously developed by USDA scientists. Staff from the AWS will perform testing in regards to fecal coliform and other parameters for their survey. ARS will provide the use of its laboratory equipment to AWS. AWS will supply reagents for parameters of their own testing. Participation in the partnership by the AWS is contingent upon the ability to obtain funding for this program from outside sources in order to satisfy the financial obligations incurred by AWS for this program.

3. Progress Report:
There is relatively little information documenting the levels of pathogenic E. coli in the Potomac River watershed. It is well established that humans, wildlife and agricultural animals are all sources of E. coli. The Potomac River watershed receives inputs from all of these sources; however, the relative contributions from each are unknown. The goal of this collaboration is to establish the levels of pathogenic E. coli in the Anacostia River, an urban/suburban watershed, which flows into the Potomac River and finally the Chesapeake Bay. Research indicates that the upper sections of the Anacostia River have higher levels of microbial contamination than the lower section, presumably due to dilution from the Potomac River. This information will help in developing watershed transport models for pathogenic E. coli.

4. Accomplishments

Last Modified: 10/16/2017
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