More than 230 Canadians aboard a Grand Princess cruise ship off the coast of California are being held for coronavirus testing, and results are starting to come in. 

There are currently 3,533 people on the ship, including 2,422 guests and 1,111 crew members. A total of 237 Canadians (230 passengers and seven crew members) are stuck on the Grand Princess. 

The ship was denied entry to its home port in San Francisco earlier this week amid growing concerns over coronavirus cases in patients who took the cruise not long ago, and after 35 passengers reported flu-like symptoms on board. 

Several attractions on the ship were initially closed down before passengers were told to isolate themselves in their staterooms as of Thursday afternoon. 

In a statement released Friday morning, Grand Princess said samples were collected from 45 people and 21 have tested positive for coronavirus. Nineteen of these were crew and two were passengers.

Twenty-one people aboard the Grand Princess cruise ship that was barred from docking in San Francisco have tested positive for #coronavirus https://t.co/iGuAnGrnTD pic.twitter.com/e9Hdic7Ffv

— Reuters (@Reuters) March 7, 2020

Videos posted online show the California National Guard delivering the coronavirus test kits to the ship by helicopter. 

WATCH: California National Guard delivering coronavirus test kits to the Grand Princess cruise ship pic.twitter.com/RpN0H6qTvU

— BNO Newsroom (@BNODesk) March 6, 2020

"Following guidelines received today from the CDC, all guests have been asked to stay in their staterooms while test results are pending," Princess Cruises said in the statement. 

The most frightening part of Pence’s statement here is not that 21 people aboard the Grand Princess tested positive for #coronavirus. It’s that only 46 people out 3,500 were tested, and almost half the tests were positive. Do the math. https://t.co/EuES7tMcp6 pic.twitter.com/qlBwI2kWcL

— Jim Roberts (@nycjim) March 7, 2020

"Guests are receiving meal deliveries in their staterooms by room service, and additional television and movie options have been added to in-room programming. Guests have also been provided complimentary internet service to stay in contact with their family and loved ones, and the ship’s internet bandwidth has been increased."

Trump on Americans on Grand Princess cruise ship:

“They would like to have the people come off. I’d rather have the people stay. I would rather because I like the numbers being where they are. I don’t need to have the numbers double because of one ship.”pic.twitter.com/v4jdj0mk3u

— Andrew Wortman (@AmoneyResists) March 7, 2020

This is now the second time that more than 200 Canadians have been quarantined on a ship due to coronavirus fears, following the Diamond Princess ship that was not allowed to dock in Japan in February. 

"He's more than welcome to come on to the ship with us and serve us our dinners and bring me my towels." Debbie Loftus, an American quarantined on the Grand Princess, responds to President Trump saying he'd be inclined to keep all passengers on the ship. https://t.co/pl7wzTnz1O pic.twitter.com/ZKjRVDXFBY

— CNN (@CNN) March 7, 2020

At least 47 Canadians contracted the virus on that cruise, and a total of 705 passengers were infected leading to six deaths.

A mother and daughter quarantined on the Grand Princess cruise ship off the coast of California say they found out 21 people aboard had tested positive for coronavirus by watching Vice President Mike Pence on TV. https://t.co/6lxmfoSWWF pic.twitter.com/z0wbfDWIbF

— CNN (@CNN) March 7, 2020

In light of this, the Canadian government is now warning of the potential dangers of cruise ships in the face of the virus outbreak. 

“Quarantining people on a ship is a bad idea.”@drsanjaygupta responds to President Trump saying he wants passengers aboard the the Grand Princess cruise ship, which has numerous crew and passengers who’ve tested positive for coronavirus, to stay at sea. pic.twitter.com/LqzAghmamK

— CNN (@CNN) March 7, 2020

"Canadians planning cruise ship travel should be aware that infectious diseases, such as COVID-19, can spread quickly due to close contact between passengers," reads a travel alert on the government's website. 

"Older people and people with a weakened immune system or underlying medical condition are at a higher risk of developing complications from COVID-19."

The more than 3,500 people on Princess Cruises' Grand Princess remained in limbo Saturday morning. https://t.co/QbqmL67PbB

— USA TODAY (@USATODAY) March 7, 2020

The alert explains that many countries are implementing policies and restrictions in order to contain the COVID-19 outbreak, which could potentially impact a cruise traveller's itinerary, ability to disembark, access to health care, and could also result in travellers being subject to quarantine procedures.