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A new study done by the Centers for Disease Control and Prevention (CDC) notes that the coronavirus lived for up to 17 days on the Diamond Princess cruise ship, significantly longer than previous studies have suggested.
The CDC research, published on March 23, notes that the virus was identified on a number of surfaces in symptomatic and asymptomatic persons, long after they had been emptied.
“A high proportion of asymptomatic infections could partially explain the high attack rate among cruise ship passengers and crew,” the researchers wrote. “SARS-CoV-2 RNA was identified on a variety of surfaces in cabins of both symptomatic and asymptomatic infected passengers up to 17 days after cabins were vacated on the Diamond Princess but before disinfection procedures had been conducted.”
A laboratory technician prepares COVID-19 patient samples for semi-automatic testing at Northwell Health Labs, Wednesday, March 11, 2020, in Lake Success, N.Y. (AP Photo/John Minchillo)
Two cruise ships were included in the study, the Diamond Princess and the Grand Princess. Both ships accounted for “more than 800 total COVID-19 cases, including 10 deaths,” the researchers noted. At the time, the two ships accounted for “approximately 17 [percent] of total reported U.S. cases.”
By March 17, there were confirmed COVID-19 cases “associated with at least 25 additional cruise ship voyages,” the researchers stated.
The experts added that the data cannot “be used to determine whether transmission occurred from contaminated surfaces,” but “further study of fomite transmission of SARS-CoV-2 aboard cruise ships is warranted.”
The implications of the study are far-reaching, the experts explained, noting that “outbreaks of COVID-19 on cruise ships pose a risk for rapid spread of disease beyond the voyage,” adding that “[a]ggressive efforts are required to contain spread.”
FILE – In this Feb. 11, 2020, file photo, media gather outside the quarantined Diamond Princess cruise ship in Yokohama, near Tokyo. (AP Photo/Jae C. Hong, File)
(AP Photo/Jae C. Hong, File)
The study, which has not been peer-reviewed yet, also notes that the virus can remain on copper surfaces for four hours and cardboard for up to 24 hours.
A separate study published in February concluded that if COVID-19 is similar to other coronaviruses, such as SARS or MERS, it could live on surfaces like metal, glass and plastic for up to nine days, Fox News previously reported.
By comparison, the flu virus can only live on surfaces for approximately 48 hours.
As of Tuesday morning, there have been more than 387,000 reported cases worldwide of COVID-19, including at least 46,450 in the U.S., an increase of more than 30 percent.