Health officials haven’t figured out the cause of the mysterious lung illness that has killed 26 people and infected 1,299 others, but they have settled on a name for it: “EVALI.”

The name, pronounced “EE-volley,” stands for “e-cigarette, or vaping, product use associated lung injury.” It comes not only as the illness shows no sign of abating, but also as officials worry that doctors will mistake EVALI for other serious infections people get around the flu season.