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Alga Bloom Lake Winnipesaukee
David Neils, the chief aquatic biologist at the New Hampshire Dept. of Environmental Services, inspects water of Lake Winnipesaukee at 19 Mile Beach, Friday, June 14, 2024, in Tuftonboro N.H., for signs of algae bloom. State officials have issued two warnings of potentially dangerous algae blooms along the lake, which is the state's largest. (AP Photo/Nick Perry)

'Tis the season for swimming and bacteria alerts in lakes, rivers

With summer about to start, many people planning to flock to their favorite swimming hole may also want to read up on bacteria warnings

By Kathy Mccormack And Nick Perry
Published - Jun 14, 2024, 01:22 PM ET
Last Updated - Jun 14, 2024, 03:31 PM EDT

TUFTONBORO, N.H. (AP) — With summer about to start, many people flocking to their favorite swimming hole may also want to read up on bacteria warnings.

During the busy Memorial Day weekend and shortly afterward, at least 20 people, most of them children, reported E. coli infections after they swam in Lake Anna, a popular recreational destination in central Virginia. Nine of those people were hospitalized. An additional 10 cases are under investigation.

In Massaschusetts, 22 beaches were closed across the state as of Friday morning. “Bacteria exceedance” accounted for more than half of the shutdowns. High bacteria levels shut down three beaches in Seattle.

Here's what to know about the most common concerns.

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