After two years of consultations involving over 100 scientists, a WHO-led working group agreed to the term to describe diseases caused by infectious particles that typically multiply in the respiratory tract and spread from the nose and throat of an infected person while they breathe, speak, sing, cough or sneeze.
Evidence gathered in the ensuing four years has prompted worldwide government action to mitigate airborne diseases. The US Centers for Disease Control and Prevention last month detailed steps that people can take to reduce the number of respiratory particles circulating indoors, a year after the White House set a “clean air in buildings” challenge. The WHO itself released in March an 83-page manual that can be used to assess the risk of airborne Covid spread.
“This would have legal, logistic, operational and financial consequences that have global implications with regards to equity and access,” the report added. The WHO also recommended distancing of more than 1 meter—within which these droplets were thought to fall to the ground—along with hand-washing, surface cleaning and sneezing into elbows. With personal protective equipment in short supply, people were advised not to not wear masks unless they were sick or taking care of someone who was.
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