More than 2.5 million cases of sexually transmitted infections were reported in 2021, jumping by 7% in one year, according to new data from the US Centers for Disease Control and Prevention.

“The US STI epidemic shows no signs of slowing,” said Dr. Leandro Mena, director of the CDC’s Division of STD Prevention.

Chlamydia accounted for more than half of the reported cases, with rates increasing about 4% in 2021. Cases of gonorrhea rose nearly 5%.