INRB, the Institut National de Recherche Biomédicale in Kinshasa, confirmed Bundibugyo ebolavirus as the species on Thursday 14 May 2026 1. The DRC national reference laboratory processed 20 samples and returned 13 positive results, a 65 per cent positivity rate. INRB is the same laboratory that handled species confirmation for Uganda's 2022 Filovirus response; its turnaround under outbreak conditions is the regional benchmark. Positivity rates above roughly 30 per cent are the indicator epidemiologists use for uncontrolled local transmission; 65 per cent sits well into that range.
The nine-day lag between WHO's 5 May signal and INRB's 14 May species confirmation is operationally fast by historical standards. The longer gap, between Ituri's April community deaths and the WHO signal, is the surveillance window that the Q1 2026 surveillance review had flagged for non-Zaire Ebola species. INRB cleared its workflow inside the institutional window it controls; the upstream gap that the 65 per cent positivity now describes is the one that surveillance architecture, not the laboratory bench, would have closed.
