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News
Flushing out hidden infections: A new study found that wastewater testing detected chlamydia-causing bacteria in up to 88% of samples across Washington State. Researchers say the approach could help public health officials spot STI hotspots — especially in communities with high rates of underreporting or asymptomatic infections. Think of it as the COVID wastewater playbook, now applied to sexual health.
Wastewater surveillance — the same tool that helped track COVID-19 spread — may now be ready to take on sexually transmitted infections. A new study published in ACS ES&T Water found that bacteria causing chlamydia were detected in up to 88% of wastewater samples collected across Washington State, suggesting the approach could be a powerful, passive way to monitor STI trends at the community level.
Researchers from the University of Washington collected two sets of samples: 132 weekly samples from five wastewater treatment plants (November 2024–February 2025) and 86 samples from six neighborhood-level sites in the greater Seattle area (January–June 2022). Chlamydia was the most consistently detected pathogen, while gonorrhea and syphilis showed up less frequently. Notably, STI detection didn't correlate with population size — pointing to the value of hyper-local monitoring. One standout finding: a neighborhood site near a college campus showed consistent chlamydia detection in wastewater but very low clinical case counts — a gap likely explained by underreporting or asymptomatic infections.
By the Numbers
Why it matters: STIs are significantly underreported, and many cases are asymptomatic. Wastewater surveillance offers a non-invasive, population-level signal that could help health departments target screening campaigns, distribute self-testing kits, and allocate resources more effectively — without relying solely on clinical reporting.
