Sars-CoV-2: to slow the spread, focus on fresh air
As evidence has accumulated over the course of the COVID-19 pandemic, scientific understanding about the virus has changed: the majority of transmissions occur as a result of infected people spewing large droplets and small particles called aerosols when they cough, talk or breathe.
Surface transmission, although possible, is not thought to be a significant risk. That doesn’t mean that cleaning doorknobs and other surfaces is pointless, but it needn’t be a priority, scientists say.
“Excessive attention on making surfaces pristine takes up limited time and resources that would be better spent on ventilation or the decontamination of the air that people breathe,” says engineer Linsey Marr, who studies airborne disease transmission.
(ex nature briefing, 1 febbraio 2021)