June 06, 2019
2 min read

WHO: 1 million new urogenital STIs acquired each day worldwide

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There was an estimated global total of 376.4 million new chlamydia, gonorrhea, trichomoniasis and syphilis infections in men and women aged 15 to 49 years in 2016, averaging out to more than 1 million new infections daily, according to the latest WHO data.

“STIs are treatable and curable with antibiotics but unfortunately, most of these infections occur without symptoms and thus people don’t realize they have the infection, they don’t realize they are at risk and they don’t go in for testing and treatment,” Melanie Taylor, MD, MPH, a medical epidemiologist in WHO’s Department of Reproductive Health and Research (RHR), said during a press briefing. “Thus, the opportunity to transmit the infection is quite high. The opportunity to transmit to sexual partners is high but also the risk of mothers to transmit these infections to their unborn babies is very, very high. These infections, if left untreated, can result in stillbirth, neonatal death, infertility among men and women, ectopic pregnancy, and increased risk of HIV transmission and acquisition.”

To generate the estimates for the report, researchers systematically searched for studies conducted between 2009 and 2016 that reported on the prevalence of certain STIs, and they also consulted regional experts. Overall, researchers found 130 eligible studies on chlamydia, gonorrhea and/or trichomoniasis. For syphilis, they found 978 data points in the Spectrum-STI database.

Results showed that the 2016 global prevalence for chlamydia, gonorrhea, trichomoniasis and syphilis among women was 3.8%, 0.9%, 5.3% and 0.5%, respectively. In men, prevalence estimates were 2.7% for chlamydia, 0.7% for gonorrhea, 0.6% for trichomoniasis and 0.5% for syphilis. According to the report, the total global estimate was 376.4 million infections 127.2 million chlamydia cases, 86.9 million gonorrhea cases, 156 million trichomoniasis cases and 6.3 million syphilis cases. This estimate corresponds to an average just over 1 million new infections daily, although the number of individuals infected is smaller due to repeat infections and common coinfections, the researchers noted.

Photo of infographic with data on urogenital infections 

“STIs should not be treated any differently than other infections, and most importantly we cannot sweep them under the carpet and pretend they do not exist,” Teodora Wi, MD, a WHO medical officer on STIs with the Department of RHR, said during the press briefing. “We are all in this together. For policymakers, make sex safer and support STI services … For program managers, researchers and experts, continue to find better ways to prevent, diagnose, screen and treat STIs … For our health care providers, respect the right of everyone to make sexual choices that fit with their own personal values ... For STI patients, be open about your sexuality so you can receive the appropriate care ... For those who choose to have sex, be rational, be responsible, be safe and have fun. Use a condom correctly and consistently. If you think you have an STI, do not be ashamed. Go to your doctor and make sure you don’t transmit to others.” – by Caitlyn Stulpin


Rowley J, et al. Bull World Health Organ. 2019;doi:18.228486.

Disclosures: The authors report no relevant financial disclosures.