Brain-eating amoeba: Who is most often infected?

The family of a 12-year-old boy who died in South Carolina this month have confirmed his cause of death to be an infection associated with Naegleria fowleri, more commonly referred to as a “brain-eating amoeba.”

It’s believed the boy, identified as Jaysen Carr, contracted the infection while swimming in Lake Murray, a central South Carolina reservoir popular with swimmers, boaters and fishermen, according to the South Carolina Department of Natural Resources.

“The family has...