Passengers and close contacts, some with symptoms, monitored until not contagious: From Santa Clara, California, to Nebraska, to Emory University in Atlanta.

Officials say at least six US states are monitoring for possible cases after several passengers from the Dutch vessel MV Hondius returned home.

The World Health Organization says Hondius passengers will disembark in groups in Tenerife, Spain, before taking flights home amid hantavirus outbreak.