Syphilis infections in the United States skyrocket to a level not seen since 1950. The disease continues to disproportionately affect gay and bisexual men, but it is also spreading among cisgender heterosexual people, according to the CDC.

The rate of new gonorrhea cases has fallen for the first time in a decade. It's unclear why syphilis rose 9% while Gonorrhea fell by a similar percentage, CDC officials said, adding that it's too early to know if there will be any in the future.