![\"\"](\"https:\/\/PERSIAN-HERITAGE.COM\/wp-content\/uploads\/2021\/04\/Fact-Check-300x200.jpg\")
DW \u2014 As many consider summer air travel, DW Fact Check spoke to experts about how to best minimize the risk of exposure during the coronavirus pandemic.<\/p>\nDW \u2014 As many consider summer air travel, DW Fact Check spoke to experts about how to best minimize the risk of exposure during the coronavirus pandemic.<\/p>\n
Air travel is generally lower risk during the pandemic \u2014 but only when airports, airlines and passengers take precautionary measures. DW Fact Check interviewed experts and examined studies to answer passengers’ frequent questions.<\/p>\n
There is scarce reliable data, so the understanding of how exactly COVID-19 transmits during flights is limited. Studies and experts, however, consistently highlight the need to wear face masks and maintain physical distance from other travelers.<\/p>\n
One case study<\/a>, published in the Centers for Disease Control and Prevention (CDC) Emerging Infectious Disease peer-reviewed journal in March, could suggest the importance of face masks and air filtration during flights. Researchers focused on the long-haul flight of EK488 from Dubai, United Arab Emirates, to Auckland, New Zealand. Using genomic sequencing, scientists found that four passengers on board became infected by one of two other passengers on the flight. Two of the passengers infected were not wearing face masks.<\/p>\n The study also noted\u00a0an important caveat that relates to air circulation. Flight EK448 made a two-hour stopover in Kuala Lumpur, Malaysia, to refuel. While no passengers entered or exited the aircraft, the plane was inoperative for around 30 minutes, meaning the environmental control system \u2014 which regulates the cold air unit and air distribution \u2014 was not on.<\/p>\n Anotherstudy<\/a>\u00a0published by the CDC, using laboratory modeling, found that leaving the middle seat open can reduce COVID exposure by up to 57%. The research, however, did not take into account passengers wearing masks.<\/p>\n When an aircraft’s ventilation system is in use, the risk of COVID transmission significantly decreases. This is how it works: Fresh, warmed and compressed air enters the cabin partly through the air-conditioning system.<\/p>\n In addition, passengers\u2019 exhaled air is cleaned with HEPA<\/a>\u00a0(High-Efficiency Particulate Air)\u00a0filters,\u00a0which are also used in hospital operating rooms, for example. These filters\u00a0are designed to retain<\/a> 99.95% of airborne particles of a wide variety of sizes, greatly reducing the risk of infection.<\/p>\n The fresh air from outside and the filtered air from inside are then mixed and pushed back into the cabin. Depending on the size of the aircraft and the duration of the flight, the amount of fresh air supplied varies, as well as how often the air in the cabin is actually completely exchanged. According to Lufthansa<\/a>, the air in a flight cabin of an Airbus320 consists of about 60% conditioned air from outside and about 40% filtered air from within the aircraft.<\/p>\n Reliable studies on ventilation systems in aircraft and the spread of COVID-19 during a flight are still lacking. But experts say that air circulation and filtration systems alone cannot completely protect against infection. HEPA filters can only clean particles that reach it \u2014 so passengers need to minimize risks, such as wearing face masks, to help avoid coming into contact with particles that did not reach the filter.<\/p>\n “On aircraft, what we found is a combination of ventilation systems that can remove up to 99% of COVID particles from the air, continuously cleaning the air in combination with face masks,” said Leonard Marcus, the director of Harvard’s Aviation Public Health Initiative, to DW.<\/p>\n The movement of passengers and cabin crew also plays a role, said Timo Ulrichs, an infection epidemiologist and professor at the Berlin-based Akkon University. When passengers and crew move about in the aircraft cabin, it can affect the direction of airflow, said Ulrichs, meaning certain air particles may linger in the cabin for longer than if passengers remain seated. This disruption, he added, could increase the risk of infection. The assessment\u00a0is backed by Dieter Scholz, a professor of Aircraft Design, Flight Mechanics and Aircraft Systems at the Hamburg University of Applied Sciences. When referring to the risks associated with people moving inside the cabin, he told DW, “the viruses, the aerosols, can then also be carried everywhere during these disruptions.”<\/p>\n Experts encourage passengers to refrain from eating or drinking while on board. But if necessary, be brief. “If a passenger briefly removes his or her mask to eat or drink, other passengers in the vicinity should keep their masks on,” said a Harvard University report on COVID risk mitigation on planes.<\/p>\n Each moment a face mask is removed on the plane \u2014\u00a0including eating and drinking during a flight \u2014 the risk of infection increases. The longer a passenger eats, the greater the risk of infecting someone, said epidemiologist Ulrichs.<\/p>\n Much of this depends on passengers’ hygiene. The aircraft\u2019s lavatory is ventilated, but it’s worth keeping in mind that you don\u2019t know the hygiene of the previous occupant, including whether\u00a0they wore a face mask, said Ulrichs. If another passenger took off their face mask while in the lavatory, more aerosolized droplets have the potential to reach you. So experts urged wearing face masks when using the toilet.<\/p>\n A case study<\/a> published in November\u00a02020\u00a0found that one passenger on board an evacuation flight from Milan, Italy, to Incheon, South Korea, may have been infected while using the lavatory. Researchers found that six asymptomatic passengers had COVID-19 while onboard. The passenger who became infected while likely\u00a0in the lavatory reported that she wore an N95 respirator<\/a> the entire flight\u00a0\u2014 except while using the toilet.<\/p>\n There are surfaces within the lavatory, beyond the toilet itself, that may have been touched by other passengers, including the water tap and door latch, for example. “It’s unlikely, but possible, that the [COVID]\u00a0particles could get on your hands \u2014 and then you could touch your face. So it’s also important to wash your hands. Using disinfectants is a good extra measure, avoid touching one’s face, and be mindful of cleaning after being in the bathroom so you can take measures that significantly reduce your risk,” Marcus said.<\/p>\n The use of face masks is highly emphasized (and in many cases required, like\u00a0in Germany<\/a> and\u00a0the US<\/a>) while at airports and on the plane. Some experts, like Marcus, go further, urging the use of two face masks to help ensure a proper seal around the nose and mouth.<\/p>\n Marcus recommended\u00a0facing forward while seated and, again, avoid eating and drinking if you can. If you need to eat or drink, first check to see if the person next to you has their mask on. If not, politely request they put it on (or seek assistance from a flight attendant if they refuse).<\/p>\n Marcus also encourages passengers to keep their personal overhead vents, known as “gaspers,” on during the flight. His recommendation is backed by a study<\/a> published in the Oxford University’s Journal of Travel Medicine that examined the risks of air travel during the pandemic, which said, “it is recommended that the gasper airflow be turned on to improve travel comfort, air quality and reduce person-to-person transmission of exhaled contaminants.”<\/p>\n The CDC in early April updated its travel guidance<\/a> to say that people who are fully vaccinated can travel at a low risk to themselves \u2014 noting that a person is only considered fully vaccinated two weeks after receiving the last recommended dose of vaccine.<\/p>\n Marcus is cautiously optimistic about\u00a0the development. “We encourage people who are vaccinated to adhere to our recommendations because that combination can allow them to fly with high levels of confidence when they’re in the airport and when they’re on the plane itself.”<\/p>\n Vigilance is also necessary as variants continue to emerge and spread. In New Zealand, an airport worker became infected with the UK variant while cleaning a plane in Auckland. The employee was fully vaccinated, New Zealand officials said<\/a>.<\/p>\n![\"A](\"https:\/\/static.dw.com\/image\/57303405_7.png\" "\\"A")
<\/div>\nHow does the plane\u2019s air circulation work \u2014 and how effective is it against virus transmission?<\/h2>\n
![\"A](\"https:\/\/static.dw.com\/image\/57303470_7.png\" "\\"A")
<\/div>\n ![\"A](\"https:\/\/static.dw.com\/image\/57308171_401.jpg\" "\\"A")
<\/a>Physically distance if you can and avoid putting down tray tables to help reduce risks, say experts<\/p>\n<\/div>\nAvoid eating and drinking during\u00a0flight<\/h2>\n
Does using the aircraft’s toilet increase the risk of exposure?<\/h2>\n
![\"An](\"https:\/\/static.dw.com\/image\/57312171_401.jpg\" "\\"An")
<\/a>Avoid the lavatory if you can, but use face masks if you must, say experts<\/p>\n<\/div>\nHow can I best protect myself during a flight?<\/h2>\n
![\"A](\"https:\/\/static.dw.com\/image\/57215255_401.jpg\" "\\"A")
<\/a>Passengers fully vaccinated are advised to still take precautions<\/p>\n<\/div>\nDo I still need to take precautions if I’m vaccinated?<\/h2>\n
![\"Two](\"https:\/\/static.dw.com\/image\/57308645_401.jpg\" "\\"Two")
<\/a>Experts recommend remaining vigilant the entire journey, including on transport to the airport, during check-in, and while at baggage claim<\/p>\n<\/div>\nWhat else should I keep in mind while flying?<\/h2>\n