Samples were collected from around 15 detainees being held in isolation on board the Norwegian Dawn.
According to authorities, the ship was prevented from landing in Port Louis over the weekend due to health and safety concerns.
Officials confirmed that there are 2,184 passengers and 1,026 crew on board.
In a statement, the Mauritius Ports Authority stated: “The decision not to allow the cruise ship access to the quay was made to avoid any health risks.”
“The health and safety of passengers as well as that of the country as a whole are of the utmost to the authorities.”