The MV Hondius cruise ship is anchored near Praia, Cape Verde, on Monday, as the country's Health Ministry said it will not allow the vessel to dock for now due to public health concerns. Arilson Almeida - The Associated Press

By GERALD IMRAY | THE ASSOCIATED PRESS

CAPE TOWN, South Africa-A cruise ship with nearly 150 people aboard was waiting for help off the coast of Cape Verde in the Atlantic Ocean on Monday after three passengers died and at least three other people were left seriously ill in a suspected outbreak of the rare hantavirus, according to the World Health Organization and the ship's operator.

The MV Hondius, a Dutch ship on a weekslong polar cruise from Argentina to Antarctica and several isolated islands in the South Atlantic, had requested help from local health authorities after making its way to the island of Cape Verde, off the WestAfrica coast. But no one has been allowed to disembark, Netherlands-based operator Oceanwide Expeditions said.

Cape Verde's Health Ministry said Monday that for now, it will not allow the ship to dock because of public health concerns and that it would stay in open waters close to shore.

Hantavirus is a rodent-borne illness spread by contact with rodents or their urine, saliva or droppings. WHO says that while it is rare, hantavirus may spread between people.

It was unclear how an outbreak could have started, and WHO said it was investigating while working to coordinate the evacuation of two sick crew members. Another sick person - a British man evacuated to South Africa on April 27 - tested positive for the virus, authorities said. He is in critical condition and isolated in intensive care, health officials said.

The body of one of the passengers who died- a German - remains on the ship, according to an Oceanwide Expeditions statement. A 70-year-old Dutch man died onboardApril 11, and his 69-year-old wife died later in South Africa after leaving the ship, officials said. Her blood later tested positive for the virus, making two confirmed cases, South Africa's health minister said.

Among the 87 remaining passengers, 17 are Americans, 19 are from the U.K. and 13 from Spain, according to Oceanwide Expeditions. Sixty-one crew members also are onboard.

Two sick crew members - one British, one Dutch - have respiratory symptoms and need urgent medical care, Oceanwide said in its statement.

Cape Verde has sent a medical team of two doctors, a nurse and a laboratory specialist to the ship over three trips, said Dr. Ann Lindstrand, a WHO official in Cape Verde.

She told The Associated Press in an interview that they were planning for medical evacuations, in which passengers would be taken from the ship via ambulance to an airport.

"It's been very tricky for Cape Verdean authorities," Lindstrand said. "What they have to deal with is a public health event. And of course, they have been thinking about the protection of the population here."

Oceanwide said it would consider moving to one of the Spanish islands - Tenerife or the port of Las Palmas - if it can't evacuate passengers in Cape Verde.

WHO said it was working with local authorities and Oceanwide on a "full public health risk assessment."

"Detailed investigations are ongoing, including further laboratory testing, and epidemiological investigations," WHO said. "Medical care and support are being provided to passengers and crew."