People infected with COVID-19 may spread the disease when they speak and breathe, not only when they let out a hearty cough.
Although these modes of transmission could help to explain how asymptomatic and mildly infected people fuel the virus’ spread, researchers don’t yet know whether tiny particles expelled in-breath infect more people than large droplets spewed through coughs, experts told Live Science.
“There’s a possibility” that COVID-19 primarily spreads via fluid particles less than 0.0002 inches (5 microns) in diameter, known as aerosols, which can be emitted when people speak, said William Ristenpart, a professor of chemical engineering at University of California, Davis. “We just don’t know,” he said. ……more