There’s increasing concern that people infected with COVID-19 who show no signs of illness are playing a large role in the transmission of COVID-19.
A study of COVID-19 patients and the people they likely infected suggests the coronavirus can spread for more than two days before symptoms appear.
And a silent spreader can transmit the coronavirus simply by talking.
It’s easier to suffocate a disease where the symptoms are obvious, and in which infectiousness occurs after symptoms show up, said Dr. Robert Kim-Farley, a medical epidemiologist and infectious disease expert at UCLA Fielding School of Public Health. For instance, there are very few asymptomatic cases of measles, and officials can identify cases, isolate them, find the infected person’s close contacts and quarantine them, snuffing out an outbreak.
That’s why, in the years before the polio vaccine was available on a large scale in the mid-1950s, many parents kept their children at home, even in the summer when the spread of the virus seemed to peak. Polio was once one of the nation’s most feared diseases,Experts estimate that 25% to 75% of coronavirus infections may be asymptomatic, Kim-Farley said.
“What we’re really trying to do is prevent transmission from talking,” Rutherford said. “We’re trying to ... prevent people who are asymptomatically infected from transmitting.”showing fans at a Georgia Tech football game during the 1918 flu pandemic, most people are wearing masks.In 1918 Georgia Tech played almost a complete football schedule during the Spanish Flu outbreak that killed more than 675,000 in the US.
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