Grantee Research Project Results
Detection of Cryptosporidium Spp. In the Wachusett Reservoir Watershed
EPA Grant Number: U915773Title: Detection of Cryptosporidium Spp. In the Wachusett Reservoir Watershed
Investigators: Jellison, Kristen L.
Institution: Massachusetts Institute of Technology
EPA Project Officer: Packard, Benjamin H
Project Period: August 1, 2000 through August 1, 2003
Project Amount: $102,000
RFA: STAR Graduate Fellowships (2000) RFA Text | Recipients Lists
Research Category: Academic Fellowships , Safer Chemicals , Fellowship - Civil Engineering
Objective:
The goal of this research project is to better characterize the behavior of Cryptosporidium oocysts in the Wachusett Reservoir watershed, the drinking water source for Boston, Massachusetts and surrounding municipalities. Specific aims of the work are to: (1) investigate seasonal trends in oocyst contamination of surface water; (2) identify Cryptosporidium species in surface water; (3) identify surrogate water quality parameters that can be used as markers for contamination risk; and (4) determine sources of oocyst contamination in the watershed.
Approach:
Water samples are filtered through Gelman Envirochek Sampling Capsules from Pall Gelman Sciences Inc. (Ann Arbor, MI) according to manufacturer's recommendations. During filtration, water quality parameters including pH, specific conductivity, dissolved oxygen content, temperature, and turbidity are measured. Typically, ~40-80L of water are filtered. Filters are transported to the laboratory on ice and eluted according to manufacturer's recommendations within 36 hours of sample collection. Oocysts are purified from water pellets or fecal samples using immunomagnetic separation (IMS) with the Crypto-Scan IMS kit from ImmuCell (Portland, ME). DNA is extracted from purified oocysts with phenol-chloroform, precipitated with ethanol, and amplified using a nested PCR assay that targets a 434-bp variable region of the 18S rRNA gene. Nested PCR products are visualized on a 1.2 percent agarose gel stained with ethidium bromide, and the nested PCR products from positive samples are cloned into the pGEM-T Easy Vector System (Promega Corporation, WI). Selected clones of the nested PCR products are sequenced on an ABI Prism 310 Genetic Analyzer (PE Applied Biosystems, CA).
Expected Results:
The water sampling method will determine the contamination risk from oocysts in the environment that may pose a threat to public health, illustrating the need for specific oocyst detection methods that identify species type and thus health risk.
Supplemental Keywords:
water, drinking water, watersheds, risk, health effects, human health, animal, organism, pathogens, biology, genetics, monitoring, northeast, Massachusetts, MA, EPA Region 1., RFA, Health, Water, Geographic Area, Water & Watershed, State, Risk Assessments, Drinking Water, Watersheds, microbial risk assessment, cryptosporidium parvum oocysts, markers, exposure, Massachusetts (MA), community water system, cryptosporidium , human exposure, water quality, drinking water contaminants, drinking water system, cryptosporidiumProgress and Final Reports:
The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.