Passengers on board the Westerdam cruise ship look towards the Cambodian port town of Sihanoukville, where it has been granted permission to dock on Thursday. (Photo by Angela Jones/Handout via Reuters)

SIHANOUKVILLE: Cambodian authorities said on Thursday that at least 20 passengers of the Westerdam cruise ship who have been ill will have their blood samples tested at the Pasteur Institute for possible novel coronavirus infection.