Syphilis cases in the United States are rising at an alarming pace, according to a new report from the Centers for Disease Control and Prevention released on Tuesday.

“We have long known that these infections are common, but we have not faced such severe effects of syphilis in decades,” said Laura Bachmann, the acting director of the Division of Sexually Transmitted Disease Prevention at the CDC. “We cannot continue to use decades-old prevention strategies to address today’s STI epidemic.”