BLACK RIVER FALLS, Wisconsin (WXOW) – More tests were conducted Monday at Jackson County's Lake Wazee.
The beach there has been closed for almost a week, after people reported feeling ill after swimming in the water July 4.
A spokesperson for Jackson County's Health Department said she is confident the sickness was caused by norovirus – a contagious infection that causes flu like symptoms and is often caused by fecal material in the water.
Sample tests from several swimmers came back positive for norovirus.
But Monday's tests were conducted as a precaution, to make sure the lake is not contaminated with something more severe.
Water samples were removed over a period of three hours.
Those will now be tested by a lab in Marshfield.
Test results are expected by Wednesday.
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