This year was supposed to be huge for the San Francisco cruise industry. More ships than ever before — 117, up from 85 last year — are calling at the port.

But the pall cast by the coronavirus over the cruise industry may affect the city.

Vessels come here primarily from other U.S. ports, as well as from Mexico and Canada, and the Port of San Francisco doesn’t expect any ships to stay away.

Nonetheless, the virus is preoccupying travelers — especially since a cruise ship stationed off Japan has had hundreds of passengers infected and far more stuck in quarantine.

“I can’t deny it, it’s on everyone’s minds,” said Sandra McShane, who lives in Britain and had gotten off the Grand Princess cruise ship that arrived from Hawaii and docked in San Francisco last week.

Marign Van Waaigan, who got off the same ship, said it had been briefly delayed due to a medical emergency on board.

“I was anxious and at first I thought it was the coronavirus, but the captain assured us it was not,” Van Waaigan said.

The 117 cruise calls scheduled for the city this year involve 32 vessels from 19 cruise lines. Many of the ships return to the city several times. The Carnival Miracle, which is set to make its maiden voyage to San Francisco in March, plans to make a total of 28 calls in San Francisco, accounting for much of the increase the city will see this year. The ship usually departs from Long Beach and heads to Hawaii and Mexico.

Port officials are monitoring the coronavirus situation, which has caused many travelers to cancel vacations and cruise companies’ stocks to tank, but they say that so far they expect no decrease in passengers.

“San Francisco is a premier destination for many tourists,” said Michael Nerney, assistant deputy director at the port. “And none of the ships that come here come from Asia.”

Revenue from cruises brings in $7.9 million for the port, including passenger and docking fees. That’s a fraction of the $122 million in revenue the port recorded for 2019. Most of the port’s revenue comes from property rentals for commercial and industrial businesses.

Before the opening of the James R. Herman Cruise Terminal at Pier 27 in 2014, the port averaged 50 cruise calls a year. Now the average is higher. The record number of cruise calls expected in 2020 mean more passengers are expected — 400,000, up from almost 300,000 in 2019, Nerney said.

“Cruises have a ripple effect on local businesses. Hotels, restaurants and shops, they all benefit,” said Laurie Armstrong Gossy, a spokeswoman for San Francisco Travel, a trade organization.

But travel agencies are now scrambling with cancellations and reroutes. Shares in Carnival Corp., which is based in Miami and operates the Diamond Princess cruise ship quarantined off the coast of Japan, are down about 16% in a month. Americans were evacuated from the ship to Travis Air Force Base in Fairfield and Lackland Air Force Base in San Antonio.

For JoAnn Giovannoni, owner of Portal World Travel in San Francisco, the reroutes have been an ordeal.

“I have a client whose cruise is now going to Singapore instead of Hong Kong,” she said, noting that the client’s itinerary did not involve San Francisco. “Finding a flight for him out of Singapore timed with the cruise has been a logistics nightmare.” She said cancellations haven’t happened yet for her, but clients are worried.

“While we certainly feel for every traveler and supplier impacted by the coronavirus outbreak; and while we have been overwhelmed with changes, re-routes (by way of air reservations and cruise) and even some cancellations ... this too shall pass,” Leah Bergner, a travel agent with Coastline Travel Advisors in Orange County, said in an email.

The global cruise industry contributed $2.5 billion to the California economy in 2018, up 5.3% from 2016 and accounting for 10.4% of the cruise industry’s spending nationwide, according to a report released in November by Cruise Lines International Association in Washington. Besides San Francisco, there are three other cruise ports in the state: Los Angeles, Long Beach and San Diego.

Vancouver, British Columbia, couple Daniel Ho and Winnie Tang thought about canceling their 10-day Mexico cruise that left from San Francisco last week. Tang said that the day before she boarded, she searched for face masks in Vancouver but every store was sold out. They plan to enjoy the trip despite the fears.

“You’ll find us at the casino and not in the swimming pool, that’s for sure,” she said.

Shwanika Narayan is a San Francisco Chronicle staff writer. Email: shwanika.narayan@sfchronicle.com Twitter: @shwanika