Health officials are monitoring an Arizona resident who was on a cruise ship where several passengers contracted hantavirus. The Arizona Department of Health Services (ADHS) stated that the person is not symptomatic and there is little threat to locals. Unlike other strains, the Andes strain that struck the cruise ship is transmitted from person to person. Local health officials will continue monitoring for 42 days from the passenger's departure from the ship. There are no vaccines or antiviral treatments, but supportive care can improve survival chances. The disease is highly dangerous and frequently fatal, with a 30-40% mortality rate.