This 1966 microscope photo made available by the Centers for Disease Control and Prevention shows a tissue sample with the presence of numerous, corkscrew-shaped, darkly-stained, Treponema pallidum spirochetes, the bacterium responsible for causing syphilis. U.S. health officials on Monday, Sept. 19, 2022, are calling for a new push to prevent sexually transmitted diseases — spurred in part by a 26% increase in syphilis cases last year. (Skip Van Orden/CDC via AP)