DON 600

WHO Disease Outbreak News 600 (DON 600) is a WHO Disease Outbreak News bulletin published on 9 May 2026, revising the agency's assessment of the MV Hondius hantavirus cluster first documented in DON 599 (2 May 2026). Disease Outbreak News (DON) is WHO's public bulletin series for confirmed or potential outbreaks of international public health concern. Published by the WHO Health Emergencies Programme, DONs present case counts, geographic scope, source data, and a formal WHO risk assessment. They are the primary mechanism through which WHO communicates outbreak status to the public and to national health authorities.

DON 600's principal change from DON 599 was the upgrade of ship-level risk from LOW to MODERATE, driven by confirmation that the causative agent was Andes virus — the only hantavirus with documented human-to-human transmission. The bulletin logged the revised case tally from the MV Hondius cluster and incorporated the Andes strain identification reported earlier in the week. The global risk assessment remained LOW, but the ship-level MODERATE designation carried clinical implications for the quarantined passengers disembarked at Tenerife and repatriated via Manchester.

DON 600 mirrors the structural format of DON 599 and is one of a pair of closely spaced bulletins that collectively document the surveillance lag between initial outbreak detection and Andes strain confirmation. The pairing illustrates a recurring weakness in DON publication cadence: case counts and risk assessments are fixed at the time of writing and may be overtaken by rapid clinical and laboratory developments within days of publication.