Coral Princess from Princess Cruises is back to los angeles on Sunday morning after dozens of its passengers and crew fell ill with Norovirus during its month-long voyage from Singapore.

The outbreak was confirmed by the Centers for Disease Control and Prevention (CDC) on Thursday, but was reported to the CDC’s Vessel Sanitation Program (VSP) on November 9. Of the 1,822 passengers on board, 55 reported being ill. Fifteen of the ship’s 907 crew members also reported being sick.

The most notable symptoms of Norovirus are diarrhea and vomiting, the CDC says. Cruise ships are required to report gastrointestinal diseases to the agency.

“Reported cases are totals for the entire trip,” the CDC said in a statement. “It doesn’t mean that all people are sick at the same time, such as when they arrive or leave a port or ship.”

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Seventy passengers and crew reported contracting Norovirus on a month-long cruise from Asia to the United States. (Princess Cruises/Fox News)

Princess Cruises cleaning and disinfection procedures increased in response to the outbreak, according to the CDC. It also “collected stool samples from cases of gastrointestinal disease for testing.”

Coral Princess left Singapore on 17 October. It made eight stops in Asia before arriving in Hawaii on Nov. 10, according to CruiseMapper.

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The passenger deck aboard the Coral Princess, a Princess Cruises ship. (Princess Cruises/Fox News)

Princess Cruises is owned by Carnival Corporation & plc. The company did not immediately respond to a FOX Business question about the outbreak.

“Norovirus is a highly contagious virus that causes vomiting and diarrhea. Anyone can become infected and sick with Norovirus,” the CDC states on its website. “Norovirus is sometimes called the ‘stomach flu’ or the ‘stomach flu.’ However, norovirus disease is not related to the flu, which is caused by the influenza virus.”

Close-up view of Coral Princess in a harbor. (Princess Cruises/Fox News)

One risk that those infected with norovirus face is dehydration, and the CDC recommends that people who have the virus drink plenty of fluids to help them recover.