Utah has turned its sewer system into an early warning network for measles, finding the virus in community wastewater samples weeks before confirmed cases appear in clinical testing data, using that advance signal to accelerate vaccination outreach in specific zip codes before an outbreak takes hold. With 499 confirmed measles cases in 2026, the highest of any single state with an ongoing outbreak in the United States, Utah has emerged as both the country's most significant active measles cluster and a national model for how wastewater surveillance can be applied to a highly contagious vaccine-preventable disease.
The approach, developed at the Utah Public Health Laboratory in Taylorsville, relies on the same molecular detection and sequencing capabilities the state built to monitor COVID-19 in wastewater during the pandemic. People infected with measles shed the virus in their feces, and that viral RNA can be detected, quantified, and genotyped from sewage samples in ways that tell public health officials not only that measles is in a community, but exactly which strain is circulating, and whether it is wild-type virus or vaccine-derived virus.
