The hot tub exhibits at a state fair might be to blame for North Carolina’s recent outbreak of Legionnaires’ diseas e and Pontiac fever, which sickened more than 100 people and killed at least one, health officials said.

Visitors to the N.C. Mountain State Fair who developed the lung infections were more likely to have walked past the hot tub displays inside the Davis Event Center , where several vendor displays were housed, the North Carolina Department of Health and Human Services said in a news release on Thursday.

As part of the investigation into the outbreak, officials compared data compiled from fair attendees who got sick and those who did not. Those who got sick, according to officials, “were much more likely to have visited the Davis Event Center while at the fair and much more likely to report having walked by the hot tub displays compared to people who did not get sick.”

Officials said early testing found Legionella bacteria in at least one water sample taken from the center, but noted that results were pending from other samples.