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We have traveled a long way from the first days of the pandemic, when the handle of handle, elevator buttons and delivery packages were judged with the virus. Now that scientists have a better understanding thanCoronavirus is especially widespread From the person to the person through aerosol droplets, it has become a little easier to navigate in everyday life and avoid specific situations. But a new study says that there is an always dangerous place, even if it is not filled with people. It provesyou canCaught Covid in closed spaces with air conditioningeven if they are not too congested.

The new search, published in the newspaperJAMA internal medicine, focused on a group in China who traveled in two buses to a Buddhist worship event held outdoors in the first days of the pandemic before the face masks became widely used. The results showed that an infected patient by Covid was able to pass the virus to up to 24 other passengers on one of thePoorly ventilated vehiclesDespite the distance accessible outside distances, even spread Covid to those of the rows even before and back. No cases of coronavirus were found on the other bus.

A key to the study lies in the fact that the two buses were judgedusing air conditioning that has recycled air through the interior of the coach. "Investigations suggest that, in closed environments with air recirculation, SARS-COV-2 is a highly transmitted pathogenic agent," wrote the authors of the study. "Our observation of potential suspension transmission in air is of great importance on public health."

The results also reveal that only patients sitting near the ventilation points of the outside air, including doors or windows that can be opened, were not infected. "[The study] adds high epidemiological evidence thanThe virus is transmitted through the air, because if it were not the case, we would only see cases close to the patient of the index, but we see him distributing throughout the bus ",Linsey Marr, PhD, Professor of Civil and Environmental Engineering of Virginia Tech and a leading expert on airborne viruses, toldThe New York Times.

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Previous studies have also shed light on the notion thatVentilation systems in closed spaces Can quickly extend COVID. A Disease and Prevention Control Center (CDC) of an epidemic of a restaurant in Guangzhou, China, has found thatAn infected person sitting near an air conditioner Has been able to infect other people sitting throughout the space, thanks to the airborne virus particles that were transported around the space via recycled air of the A / C unit.

Marr also notes that the new study gives it a concern for the next few months, when people will be more likely to gather inside. That's why she urges Americans to "avoid congested interior spaces where people do not wear masks and ventilation is mediocre". And if you try to keep Covid at the bay, be sure to avoid this type of mask becauseThis facial coating is effectively worse than no mask at all, studying.