A single passenger spread Covid-19 to 15 other people aboard a flight from London to Hanoi, Vietnam, according to a study published Friday by the Centers for Disease Control and Prevention.

Researchers identified a 27-year-old woman from Vietnam who had a sore throat and a cough before the flight as the source of the outbreak. Twelve passengers in business class and two in economy, as well as a crew member, were infected on the March 1 flight, the study says.

Upon arrival, her symptoms progressed further, and she tested positive four days later.

By March 10, contact tracing was conducted for all 217 people aboard the Vietnam Airlines flight, the study said. While people aboard the flight had traveled to 15 provinces in Vietnam, there was no "strong evidence" supporting potential Covid-19 exposure to others outside those on the flight.
"The risk for on-board transmission of SARS-CoV-2 during long flights is real and has the potential to cause Covid-19 clusters of substantial size, " the study's authors wrote. "Our findings call for tightened screening and infection prevention measures by public health authorities, regulators, and the airline industry. "

Health officials said that at the time of Flight VN54's arrival, passengers and crew members were not required to wear masks in airplanes or at airports. All passengers from Covid-19-infected areas, including the U. K., were screened by thermal imaging upon arrival, but the study does not say whether the woman was flagged for symptoms.







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