Introduction
Chlamydia, gonorrhea, chlamydia
SEXUALLY TRANSMITTED INFECTIONS, STIS, CHLAMYDIA, GONORRHEA, COMPLICATIONS
Chlamydia and gonorrhea are two of the most common bacterial sexually transmitted infections (STIs). Each year, there are an estimated 129 million new cases of chlamydia and 82 million new cases of gonorrhea globally, and the majority are asymptomatic [Testing, especially for high-risk women, is essential for chlamydia and gonorrhea control and the reduction of adverse sexual and reproductive complications [A pay-it-forward health approach may help promote test uptake among FSWs. In a pay-it-forward approach, one person receives a gift (eg, a free STI test, alongside community-engaged messages) and then is asked whether they would like to donate money to another person [This multisite cluster randomized controlled trial (RCT) aimed to evaluate the effectiveness and cost of a pay-it-forward strategy in increasing dual chlamydia and gonorrhea testing among FSWs in 4 cities of Guangdong Province, China, compared with a standard fee-based system.