Traces of the virus were detected on plastic and steel up to three days after contamination
, one of the first to examine the lifespan of the virus on common surfaces, offers some answers.
Like the common cold, covid-19 spreads through virus-laden droplets of moisture released when an infected person coughs, sneezes or merely exhales. A team of researchers, including scientists from America’s National Institute of Allergy and Infectious Diseases, simulated how an infected individual might spread the virus in the air and on plastic, cardboard, stainless steel and copper. They then measured how long the virus remained infectious in those environments.
They found that SARS-CoV-2 stays more stable on plastic and steel than on cardboard or copper. . SARS-CoV-2 survived on cardboard for up to one day. On copper, the most hostile surface tested, it lasted just four hours . In the air, the team found that the virus can stick around for at least three hours. In the air, as elsewhere, the virus’s ability to infect people diminished sharply over time.
These findings are likely to assuage some fears. Homebound consumers worried about contagion from cardboard delivery boxes may have less to worry about the next time Amazon rings . At the same time, the findings will amplify concerns about airborne transmission, which some experts had not considered possible. The research may change the way medical workers interact with infected patients, who with close contact may transmit the virus onto protective gear.
Why the virus can survive longer on some surfaces rather than others still remains something of a mystery. Maybe it has to do with the consistency of the object playing host to the virus. Cardboard, of course, is much more porous than steel, plastic or copper. But the authors noted that there was more variation in their experiment for cardboard than for other surfaces, and the results should be interpreted with caution. No doubt consumers are used to treating their surroundings that way by now.
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