![]() These are thought to travel relatively short distances and drop quickly from the air. The agency has maintained that the virus is spread mainly by contaminated surfaces and by droplets bigger than aerosols that are generated by coughing, sneezing and talking. ![]() Morawska is “really pleased, relieved, and amazed”, by the WHO’s statement.įor months, the WHO has steadfastly pushed back against the idea that there is a significant threat of the coronavirus being transmitted by aerosols that can accumulate in poorly ventilated venues and be carried on air currents. ![]() “We have to be open to this evidence and understand its implications regarding the modes of transmission, and also regarding the precautions that need to be taken,” said Benedetta Allegranzi, technical leader of the WHO task force on infection control. In response to the commentary, the WHO has softened its position, saying in a press conference on July 7 that it will issue new guidelines about transmission in settings with close contact and poor ventilation. The researchers are frustrated that key agencies, such as the World Health Organization (WHO), haven’t been heeding their advice in their public messages. They also call for preventive measures to reduce this type of risk. This week, Morawska and aerosol scientist Donald Milton at the University of Maryland, College Park, supported by an international group of 237 other clinicians, infectious-disease physicians, epidemiologists, engineers and aerosol scientists, published a commentary in the journal Clinical Infectious Diseases that urges the medical community and public-health authorities to acknowledge the potential for airborne transmission. After months of debate about whether people can transmit the virus through exhaled air, there is growing concern among scientists about this transmission route. But the sign might be outdated.Ĭonverging lines of evidence indicate that SARS-CoV-2, the coronavirus responsible for the COVID-19 pandemic, can pass from person to person in tiny droplets called aerosols that waft through the air and accumulate over time. In Lidia Morawska’s home city of Brisbane on Australia’s east coast, roadside signs broadcast a simple message: ‘Wash hands, save lives.’ She has no problem with that: “Hand washing is always a good measure,” says the aerosol scientist, who works at the Queensland University of Technology.
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