As the spread of the Omicron variety in the United States shows no signs of slowing, Norwegian Cruise Line canceled voyages on eight ships on Wednesday, some with embarkation dates as far out as late April.

With the United States reporting roughly 1 million new coronavirus illnesses on Monday, the biggest daily total of any country in the world, Norwegian Cruise Line Holdings Ltd made the choice.

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"Due to ongoing travel restrictions, we've had to modify a few sailings and unfortunately have had to cancel," Norwegian Cruise said.

The Centers for Disease Control and Prevention (CDC) in the United States has initiated investigations into 94 ships for onboard COVID-19 cases, with a few Norwegian Cruise ships also being monitored.

If at least 0.10 % of passengers test positive for COVID-19, the CDC begins to investigate. Last week, the CDC warned individuals to avoid going on cruise ships regardless of their vaccination status.

All sailings on the Norwegian Pearl ship with departure dates through and including Jan. 14 have been canceled by Norwegian Cruise, which requires all passengers and guests to be vaccinated.

On Tuesday, the cruise operator announced that a 12-day Panama Canal roundtrip from Miami on its Norwegian Pearl ship had been canceled due to "COVID related circumstances."

Other Norwegian Cruise ships, such as the Norwegian Getaway, Norwegian Sun, and Norwegian Spirit, have all been canceled. Guests will receive full automatic refunds as well as extra credits that can be used for future bookings, according to the statement.

According to the company's website, it has 17 ships.