Potentially several hours, or even days, according to a preprint published this week by researchers at the National Institutes of Health, Princeton, and the University of California, Los Angeles. The researchers exposed various materials to the virus in the lab. They found that it remained virulent on surfaces for a lengthy period: from up to 24 hours on cardboard to up to two or three days on plastic and stainless steel. It also remained viable in aerosols—attached to particles that stay aloft in the air—for up to three hours
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