Growing evidence suggests that COVID-19 infection is related to prolonged time exposed to the virus.
The main idea is that people get infected when they are exposed to a certain amount of viral particles. That viral threshold can be reached by an infected person's sneeze or cough, which releases a large number of viral particles into the air. But an infected person talking or even just breathing still releases some virus into the air, and over a long period of time in an enclosed space, that could still infect others.
The importance of time exposed to a virus is relevant for all infectious diseases, from measles to tuberculosis to Covid-19, said Dr. Kent Sepkowitz, an infectious disease specialist at Memorial Sloan Kettering Cancer Center in New York., which tries to locate and contact anyone who has spent prolonged time near an infected person.
"Even if there is virus in that environment, you hopefully haven't had that extended time needed to get to that infectious dose. The employees, though, are in that environment all day," he said. "So what wouldn't infect you and I because it didn't get to that infectious dose number, has a much stronger effect or larger effect on an employee that gets that low dose all day.
No one reported physical contact between the attendees at the practices, but they sat close together. The report said the chairs were 6-10 inches apart, but there were empty seats between some of the members. The choir broke into two groups for part of the practice, and members moved closer together for that 45-minute session, they said.
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