Outbreak briefing

As of May 31, 2026, two active outbreaks are being monitored globally. The lead outbreak is the Ebola disease caused by Bundibugyo virus, which is affecting the Democratic Republic of the Congo and Uganda. This outbreak has reported 134 confirmed cases, 906 probable cases, and 223 deaths. The second lead outbreak is a Hantavirus outbreak linked to cruise ship travel, which has been reported in multiple locations across eight countries. This outbreak has reported 11 confirmed cases, 2 probable cases, and 3 deaths.

The ongoing Ebola outbreak in the Democratic Republic of the Congo and Uganda, as well as the Hantavirus outbreak linked to cruise ship travel, are receiving close surveillance attention. Authorities and journalists should continue to monitor these outbreaks, particularly in the Democratic Republic of the Congo and Uganda, where the Ebola outbreak is most severe.