Today in the Wall Street Journal:
Stomach Virus Spreads Through Cruise Ships at Fastest Pace in Years
CDC has reported 13 norovirus outbreaks through first half of 2023
Cruises are packed as more travelers choose long-delayed vacations at sea. The downside: Higher numbers of those passengers are getting sick.
So far this year, there have been 13 outbreaks of norovirus on cruise ships, according to reports from the U.S. Centers for Disease Control and Prevention. That marks the largest number of norovirus incidents on these vessels in a single year since 2012—and the year is only halfway over.
The most recent outbreak occurred on a North Atlantic Viking Cruises sailing that docked in New Jersey on June 20. More than 100 passengers fell ill, according to the CDC, accounting for 13% of all vacationers on the ship. Crew members also contracted the gastrointestinal illness.
Viking Cruises said it believes that the recent outbreak on its Neptune vessel “originated from a shoreside restaurant in Iceland where a group of guests dined during their free time.”
Norovirus is particularly contagious, says Dr. William Schaffner, a professor of infectious diseases at the Vanderbilt University Medical Center, and it thrives in the closed environment of a cruise ship. Health experts say normal sanitary tactics such as using hand sanitizer aren’t effective against norovirus, and people can get sick from ingesting very few particles of the virus.
“The opportunities for close person-to-person spread are so intense on a cruise ship that once this virus is introduced into that population, it has many, many opportunities to spread,” he says.
Taking Precautions
Across the 13 outbreaks among cruises that docked in the U.S., nearly 1,700 passengers reported being ill during their voyages, along with more than 240 crew members. The Cruise Lines International Association forecast that around 31.5 million passengers will go on cruises worldwide this year.
“Because cruise ships report illnesses to the CDC, there is more visibility and faster reporting to health authorities, which should not be confused to mean a higher incidence rate onboard,” a spokeswoman for the Cruise Lines International Association said.
The CDC reports outbreaks when 3% or more of passengers or crew report symptoms of gastrointestinal illness to the ship’s medical staff on voyages under their jurisdiction. The ships also must have more than 100 passengers and sailings between three and 21 days long for an outbreak to be reported. In the five years before the start of the Covid-19 pandemic, there were an average of around 11 outbreaks of gastrointestinal illness a year on cruise ships, based on data from the CDC.
“We’re returning to what the norm was,” says Ross Klein, a researcher who has tracked health and safety incidents on cruise ships.