North Carolina health officials were investigating multiple cases of cryptosporidium they believed were linked to a south Charlotte pool, located on a K-12 college prep school.

Officials with the Mecklenburg County Public Health Department said they could confirm six cases of the parasite believed to have been acquired at the pool on the Charlotte Latin School campus.

SwimMAC Carolina club, one of the largest and most prominent swim teams in the country — which owns and operates the pool — voluntarily shut the pool down twice last month to clean and disinfect it.

Commonly known as crypto, cryptosporidiosis is a diarrheal infection that can last up to two weeks in healthy people.

Cases continued to appear at the pool after its first closure, so the club closed the pool for a second round of disinfection.

“The timeline for exposure is unclear at this moment, and we are not certain whether these infections were acquired prior to the first pool closure,” public health officials said.

SwimMAC head coach Chuck Batchelor said that in addition to shocking the pool to kill the parasite, they’ve been making other changes to prevent future outbreaks.

“We’re requiring all swimmers to take a shower before they enter the pool,” Batchelor said. “(We’re) going to eliminate street shoes from coming onto the deck. Because if something is tracked in from the outside, and a swimmer steps in the same area and it gets into the pool, there’s no way to know how or what happened. But we’re going to do everything possible so it never happens again.”

No additional cases have been reported since the pool’s second closure.