90-Second Read: Hantavirus cases rise to 11 as cruise ship passengers quarantine

Global health officials warn that the number of Hantavirus cases, which was 11 on Tuesday, could rise, as one American who was on the cruise ship at the center of the outbreak revealed new details from his quarantine room. Since the Hondius departed with almost 150 aboard for a nature-sightseeing mission on April 1, nine cases of the Hantavirus have been confirmed by lab results, in addition to two suspected cases. Given Hantavirus's long incubation period of 42 days, "we might see more cases in the coming weeks," said Tedros Adhanom Ghebreyesus, the director-general of the World Health Organization. Of the 18 American passengers who arrived stateside this week, two are in biocontainment units "out of an abundance of caution," the Department of Health and Human Services said in a statement.

The luxury cruise ship arrived early Sunday at the island of Tenerife, the largest of Spain's Canary Islands off West Africa, where passengers started repatriating to their home countries. Passengers received health screenings upon arrival in Spain, the country's Health Ministry said in a statement. This isn't the first Hantavirus outbreak in recent history. Jake Rosmarin, who is quarantined in Omaha, Nebraska, spoke to NBC News from his room at the University of Nebraska Medical Center.

He and 15 other Americans will remain at the National Quarantine Center for a few days after returning home from the MV Hondius on Monday. Let me be crystal clear: The risk of Hantavirus to the general public remains very, very low. American and global health officials have stressed throughout the outbreak that the risk to the wider public is low and that transmission is limited to close contact. Thirty-four people were sickened after several people with Hantavirus attended a variety of social events, including a birthday party.

There is particular attention on a bird-watching trip in southern Argentina, which the first passenger to die took part in before joining the cruise. Brendan Jackson, acting director of the high-consequence pathogens and pathology division at the Centers for Disease Control and Prevention, acknowledged that there's a lot more to learn about Hantavirus. The World Health Organization is investigating and trying to pinpoint the origin of the outbreak.