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- W28037980 abstract "This project was designed to assess the potential for contamination of produce during irrigation with wastewater from animal operations. Dairy wastewater from the University of Arizona Campus Dairy Research Center was used to irrigate three different types of vegetable crops: lettuce, carrot, and bell pepper. This study was conducted over twoconsecutive years. The crops were planted in February and vegetables were harvested from May through July. Irrigation water and vegetable samples were examined for Escherichia coli, Clostridium perfringens. Listeria monocytogenes, and coliphage. In the dairy wastewater, E. coli concentrations averaged 5.7 x 10^ MPN/100 mL in the first year (2000), and 9.9 x 10^ MPN/100 mL in the second year (2001). C. perfringens concentrations were nearly the same in both years (1.7 x 10'' and 3.4 x 10* CPU per 100 mL). Coliphage averaged 2.0 PPU/mL in 2000 and 1.3 x lO'' PFU/mL in 2001 in wastewater. E. coli was detected with greater frequency on carrots (100 and 96%) succeeded by lettuce (67 and 96%) and bell peppers (63 and 58%). The same was true for C. perfringens: carrots (100%), lettuce (86 and 88%), and bell peppers (100 and 50%). Coliphages were not detected on any of the vegetable crops except for average concentrations of 2 PFU/g on lettuce in the first year. L. monocytogenes was not detected on any of the vegetable samples. ANOVA test results indicates that E. coli and C. perfringens concentrations on three crops were statistically different (p <0.0001) which suggest that the degree of contamination on the surface of the vegetables depends on where the edible portion of the crop is situated (above the soil or under the soil). The greatest contamination occurred on the carrots followed by lettuce and bell peppers. E." @default.
- W28037980 created "2016-06-24" @default.
- W28037980 creator A5049727485 @default.
- W28037980 date "2003-01-01" @default.
- W28037980 modified "2023-09-24" @default.
- W28037980 title "Occurence of pathogenic and indicator microorganisms on produce irrigated with dairy wastewater" @default.
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