SALT LAKE CITY (AP) — Health investigator Mackenzie Bray smiles and chuckles as she chats by phone with a retired Utah man who just tested positive for the coronavirus.

She’s trying to keep the mood light because she needs to find out where he’s been and who he’s been around for the past seven days. She gently peppers him with questions, including where he and his wife stopped to buy flowers on a visit to a cemetery. She encourages him to go through his bank statement to see if it reminds him of any store visits he made.

Midway through the conversation, a possible break: His wife lets slip that they had family over for Mother’s Day, including a grandchild who couldn’t stop slobbering.

“Was there like a shared food platter or something like that?” Bray asks. “There was, OK, yep ... sharing food or sharing drinks, even just being on the same table, it can spread that way.’”

Suddenly, with a shared punch bowl, the web has widened, and Bray has dozens more people to track down.

She is among an army of health professionals around the world filling one of the most important roles in the effort to guard against a resurgence of the coronavirus. The practice of so-called contact tracing requires a hybrid job of interrogator, therapist and nurse as they try coax nervous people to be honest.

By BRADY McCOMBS