Under the surface of your favorite swimming pool, beach, and lakes, hazards too small to be seen by the naked eye might loom.

These bacteria, viruses, and parasites can turn a refreshing plunge into a nasty infection.

“There’s a variety of microorganisms that can make recreational activities in water less than fun,” said Dr. Stacey Rose, associate professor of infectious diseases at Baylor College of Medicine in Houston. “Microorganisms thrive in every type of water, and infections will impact everyone differently.”

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