An early-stage clinical trial yielded promising results for a chlamydia vaccine, researchers reported Thursday in The Lancet Infectious Diseases. 

There is currently no vaccine to protect against the sexually transmitted infection, which is the most common bacterial STI in the United States, according to the Centers for Disease Control and Prevention. In 2022, there were more than 1.6 million cases.

Chlamydia remains one of the most common causes of infertility in women, said Dr. Jay Varma,…