12 confirmed hantavirus cases. 3 deaths reported. WHO urges monitoring of passengers linked to MV Hondius. Initial spread linked to rodent exposure during Arctic cruise from Keflavik, Iceland. Andes virus strain can transmit between people in rare cases. Incubation period is six weeks, 600 people under monitoring in 30 countries. Netherlands' risk is very low after enhanced cleaning. Voyages resume June 13, no disruption