Related Experiment Video
Updated: Jun 24, 2026

Development of Multiplex Real-Time RT-qPCR Assays for the Detection of SARS-CoV-2, Influenza A/B, and MERS-CoV
Published on: November 10, 2023
Measles Outbreak in Cook County, Illinois, September-October 2025
Demian Christiansen1, Sheila Giovanni1, Mabel Frias1
1Cook County Department of Public Health, Forest Park, IL, USA.
None:
AbstractA small community outbreak of measles in suburban Cook County, Illinois occurred in September-October 2025. Cook County Department of Public Health investigators identified four measles cases, including one unvaccinated pediatric index case, two vaccinated adult secondary cases, and an unvaccinated pediatric tertiary case. At least 99 individuals were exposed to measles, including 79 (80%) people exposed in emergency department waiting rooms on two separate dates. Incomplete exposure information was ascertained by public health investigators, which might have contributed to preventable health care exposures.
Related Concept Videos
Investigation of Disease Outbreaks
Steps in Outbreak Investigation
Chickenpox
Diphtheria
Vaccinations
Respiratory Syncytial Virus Disease