Amid increasing measles outbreaks in multiple U.S. states, a team of researchers from Johns Hopkins University, including Lauren Gardner, the Alton and Sandra Cleveland Professor in the Department of Civil and Systems Engineering (CaSE) and Director of the Center for Systems Science and Engineering, has begun tracking publicly reported measles cases across the U.S.
The project is a collaborative, interdisciplinary effort led by Gardner in the Whiting School of Engineering, and Bloomberg School of Public Health’s Shaun Truelove, assistant scientist in the Departments of International Health and Epidemiology, and William Moss, Executive Director of the International Vaccine Access Center and Professor in the Departments of Epidemiology, Molecular Microbiology and Immunology, and International Health.
The team’s dashboard presents data and maps based on reports from official sources, including state and county health departments and additional county-level news releases or news articles. While the data represent all laboratory-confirmed measles cases reported by public health authorities in 2025, the data does not include probable cases, which are cases that have not yet been confirmed by a laboratory or publicly reported.
“Tracking measles cases at a county-level is critical for multiple reasons,” said Gardner. “It supports public health decision makers to develop evidence-based policy, it supports research efforts that improve our understanding of measles spreading patterns and predicting further spread, and most critically, it informs the general public. Real-time data on outbreaks helps individuals better understand the risk of measles in their community and promotes informed risk-mitigating behavior to protect themselves and the people around them.”
The dashboard is updated every Tuesday and Friday around 3:00 p.m. EST.
View the Johns Hopkins U.S. Measles Tracker.