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Covid-19 Case Cluster Linked to One Flight Stirs Debate Among Health Experts
HONG KONGâRashida Fathimaâs anxiety levels spiked as she boarded the red-eye flight from New Delhi to Hong Kong with her family. Covid-19 cases were surging in India, and the plane was packed almost to capacity.
Within two weeks of landing, Mrs. Fathima, her husband and two children tested positive for the coronavirus at their quarantine hotel. More than a third of the passengers on flight UK6395â52 so farâhave tested positive, the most from any plane arriving in the city. The cluster is stirring debate among health experts in Hong Kong over how they got infected, and highlights the struggle facing the aviation industry as it seeks to get people traveling again.
Speaking from the hospital, Mrs. Fathima said she feared her family picked up the infections on the April 3 journey, despite wearing masks almost the entire time and avoiding using the restrooms on board.
Some passengersâincluding one in the same rowâcoughed repeatedly during the six-hour flight, people took masks off to eat, and some parents walked their crying children up and down the aisle, she said.
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The airline and the organizers of the chartered flight told The Wall Street Journal that they did everything possible to minimize potential transmission.
Vistara airline, run by Tata SIA Airlines Ltd., said it ensures âstrict compliance with all guidelines issued by the Indian as well as the destination countriesâ authorities for all flights.â
Experts say that plane travel is generally safe. But even with the best precautions there are risks associated, as coronavirus cases continue to soar in some parts of the world and with young children not yet eligible for vaccination.
There could, for example, have been passengers with particularly virulent strains of the virus. Being packed in tightly, no matter how good the ventilation, puts certain passengers in the way of potential infection through respiratory particles from people sitting nearby or on surfaces in restrooms. And there is the risk of the virus spreading at airports before and after flying.
Other possibilities being discussed by health experts include whether travelers became infected at quarantine hotels in Hong Kong after arrival, or a failure by Indiaâs overloaded health system to accurately detect cases before the passengers leftâthough only four tested positive on arrival.
Rashida Fathimaâs 2-year-old son and 8-year-old daughter on a morning connecting flight from Chennai to New Delhi, before their flight to Hong Kong.
India is in the grips of a startling second wave of coronavirus infections. On Friday, the country reported more than 332,000 new infections, the highest one-day tally recorded in any country since the pandemic began. It would also be possible, epidemiologists say, that some passengers on the plane got infected in the country after their preflight virus test.
It is unclear how many passengers on the flight had received any Covid vaccinations. At the time of boarding, 4.76% of Indiaâs population had received at least one dose of a Covid vaccine, according to Our World in Data, an Oxford University project tracking the global vaccine rollout. Mrs. Fathima and her husband were not age-eligible for a vaccine at the time.
Hong Kong suspended flights from India for two weeks on Tuesday and upgraded India to the list of extremely high-risk countries for arrivals. The city has one of the most stringent testing, tracing and quarantine systems in the world, mandating 21 days of hotel quarantine for almost all inbound international travelers and subjecting them to several rounds of Covid testing over the period. This offers a more detailed glimpse of travelersâ infection status. Most of the cases on the flight from New Delhi werenât discovered until days after the group had landed in the city.
University of Hong Kong scientists who work with the cityâs health department are sequencing genomes from the passenger cluster and examining information to discern whether they were infected on board.
Hong Kong-based GC Nanda & Sons Ltd., known as Nanda Travel, which organized the charter flight said the Airbus A321neo plane was at 85% capacity, with 146 passengers and 7 infants.
All passengers produced evidence of a negative Covid-19 test from reputable labs taken within the 72 hours before the plane took off, the company said. Six passengers were denied boarding by the charter operator as their test-results certificates didnât meet the travel companyâs standards.
Passengers were required to wear masks except for when eating prepackaged meals. Alcohol wipes and hand sanitizer were provided.
âWeâre shocked by this,â said Poonam Nanda, the director of Nanda Travel. âThis one flight appears to be an astonishing outlier and we are all confounded by these numbers.â
Of 29 charter flights the company has operated to bring stranded travelers back to Hong Kong in the past few months, less than 1% of passengers tested positive on arrival and on many flights there have been zero subsequent cases, she said. The company will enhance its protocols, such as requiring negative Covid-19 test certificates from not more than 48 hours before departure on future flights, she said.
âThe risks of air travel are generally quite manageable with staggered seating and consistent mask usage, especially when using toilet facilities,â said Siddharth Sridhar, a clinical virologist at the University of Hong Kongâs Department of Microbiology.
As India suffers an overwhelming second wave of coronavirus infections, scientists are trying to understand a new âdouble-mutantâ variant that was first detected in the country. Photo: Rafiq Maqbool/Associated Press
Ventilation and air filtration further reduce risk of virus transmission on planes, Dr. Sridhar said. Yet there are many variables that could have an impact, including whether people wore masks consistently on board, whether meals were served, how many restrooms were operational, and how many of the passengers were part of single family units, he said.
Blocking the middle seat on airplanes can reduce coronavirus risks to passengers by 23% to 57%, a Centers for Disease Control and Prevention lab-based study published this month suggested. Despite that, most carriers in the U.S. have resumed selling middle-seat tickets.
The real issue is how passengers comply with regulations, said Leo Poon, a professor at the University of Hong Kongâs School of Public Health. A study he co-wrote last year showed that SARS-CoV-2âthe virus that causes Covid-19âcan be transmitted on airplanes, highlighting the importance of continuing infection control.
Mrs. Fathima, who runs an import-export business in Hong Kong, said a morning connecting flight from Chennai to New Delhi and the diaper-changing room at the Hong Kong airport could also have been potential places where she, her husband, 8-year-old daughter and 2-year-old son picked up the virus.
âWe were so careful when we were in India,â Mrs. Fathima said, adding that the family stayed home for a week before traveling. âI never would have imagined catching the virus on the journey.â
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