The unprecedented and deadly cruise ship hantavirus outbreak, explained

An outbreak of hantavirus on the cruise ship MV Hondius has infected eight people and killed three.

Passengers and crew remained isolated at sea while WHO, CDC, ECDC, and Spanish authorities coordinated a controlled disembarkation.

Health officials say the wider public risk is extremely low, though former passengers are being monitored as a precaution.

The response is being watched as a test of international outbreak containment on a confined vessel.