Abstract
A 2 year survey has been carried out on the wastewater and effluent of the Haifa treatment plant in order to gather information on the concentration and composition of the enteric viral population. The results obtained showed (a) the enteric viruses are present in wastewater and effluent all year round. (b) Their numbers fluctuate and are usually lower during the winter. (c) The highest numbers have been recorded between April and September with peaks occurring in wastewater during the month of July (106,000 PFU 100 ml −1) and in effluent in August (94,000 PFU 100 ml −1). During the months January through March the most prevalent viruses isolated were Polio I and ECHO 4.
Published Version
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