Adding to growing evidence that the coronavirus can spread through the air, scientists have identified genetic markers of the virus in airborne droplets, many with diameters smaller than one-ten-thousandth of an inch.

That had been previously demonstrated in laboratory experiments, but now Chinese scientists studying real-world conditions report that they captured tiny droplets containing the genetic markers of the virus from the air in two hospitals in Wuhan, China, where the outbreak started.

Their findings were published on Monday in Nature, the journal​.

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It remains unknown if the virus in the samples they collected was infectious, but droplets that small, which are expelled by breathing and talking, can remain aloft and be inhaled by others.

“Those are going to stay in the air floating around for at least two hours,” said Linsey Marr, a professor of civil and environmental engineering at Virginia Tech who was not involved with the Nature paper. “It strongly suggests that there is potential for airborne transmission.”

Ms Marr and many other scientists say evidence is mounting that the coronavirus is being spread by tiny droplets known as aerosols. The World Health Organisation has so far downplayed the possibility, saying that the disease is mostly transmitted through larger droplets that do not remain airborne for long, or through the touching of contaminated surfaces.

Even with the new findings, the issue is not settled. Although the coronavirus RNA — the genetic blueprint of the virus — was present in the aerosols, scientists do not know yet is whether the viruses remain infectious or whether the tests just detected harmless virus fragments.

“The missing piece is viable viral replication,” said Harvey V Fineberg, who leads the Standing Committee on Emerging Infectious Diseases and 21st Century Health Threats at the National Academies of Sciences, Engineering and Medicine. “Could you culture this virus from the air?”

In the Wuhan research, no viruses were detected in most of the public places they studied, including the residential building and the supermarket, although some levels were detected in crowded areas outside one of the hospitals and in the department stores.

“It was interesting to see there were measurable amounts,” Ms Marr said. “I think it adds good evidence to avoid crowding.”

The New York Times

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