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Event description
The Bundibugyo virus disease (BVD) outbreak in the Democratic Republic of the Congo continues to intensify, with sustained transmission, expansion into new health zones, and increasing risks of national and regional spread. In Uganda, additional cases have also been reported, all linked to previous cases or to travel from the Democratic Republic of the Congo. Since our previous update (Sitrep #2) with data as of 24 May 2026, the Democratic Republic of the Congo has reported an additional 216 laboratory-confirmed cases, including an additional 38 confirmed deaths. The outbreak has expanded from 13 to 23 affected health zones, across Ituri (15), North Kivu (seven), and South Kivu (one) provinces. In Ituri province, 15 of the 36 health zones are now affected, with Aungba, Damas, Gety, Komanda, Lita, Logo, and Mangala being the newly affected health zones. In North Kivu province, the detection of confirmed cases in Beni and Kyondo health zones has increased the number of affected health zones to seven out of 35.

Democratic Republic of the Congo
As of 31 May 2026, a total of 321 laboratory-confirmed cases, including 48 confirmed deaths, have been reported across the three affected provinces of Ituri, North Kivu and South Kivu in the Democratic Republic of the Congo. Of the 1077 previous suspected cases, including 246 suspected deaths reported to date, those testing positive have been reclassified as confirmed cases, while those with negative laboratory results have been discarded and removed from the case count. A total of 116 suspected cases remain under investigation and are not yet reflected in the reported totals. The outbreak remains heavily concentrated in Ituri province, which accounts for 299 confirmed cases (93.1%), followed by North Kivu (19 confirmed cases), and South Kivu (three confirmed cases). Within Ituri Province, the most affected health zones are Bunia, Rwampara, Mongbwalu, and Nyankunde.