Outbreak Watch: August 28, 2026

In this Outbreak Watch, we return to the outbreaks and signals we’ve been tracking...and several have changed.  New genomic evidence is revealing the hidden early months of the DRC’s Bundibugyo Ebola outbreak, while Uganda has successfully ended transmission across the border. New World screwworm is worsening in Sonora as cattle imports into Arizona resume, and COVID-19 is climbing again across the South amid changes to how CDC categorizes and displays wastewater activity. We also check in on measles, Cyclospora, H5 avian influenza, Vibrio vulnificus, mpox, Oropouche, and other signals on the board—and close the loop on the quarantined riverboat near Kinshasa. Full citations in companion blog post at Infectious Dose. Subscribe to Field Notes to continue the conversation around episodes and weekly outbreak updates.