With the summer heat intensifying, more people are getting in the water to cool off.

The Centers for Disease Control and Prevention is warning swimmers about a parasite called cryptosporidium, a growing threat that can survive in chlorinated water.

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MARTA's Kensington Station in DeKalb County, seen last month, was the site of a bus collision Sunday, Nov. 2, 2025, a MARTA spokesperson said. (Abbey Cutrer/AJC)

Credit: abbey.cutrer@ajc.com