After 7 days, Outer layer of surgical mask Still detectable A large number of infectious viruses.
A recent study by the US Centers for Disease Control and Prevention (CDC) has shown that coronavirus can survive on the surface for up to 17 days, based on research on the Diamond Princess and Supreme Princess.
A previous study in Hong Kong, China stated that the new coronavirus can survive for 7 days in the outer layer of surgical masks.
However, researchers from the United States reported that after 24 hours on cardboard, no surviving SARS-CoV-2 (new coronavirus) was detected, which indicates that the use of postal services is relatively risk-free. Experts also announced that printed paper, including newspapers, can kill the virus within 3 hours, so the possibility of being infected by the transported goods is very low.
The World Health Organization says the virus is unlikely to contaminate commercial commodities through infected persons, including those shipped through post offices.
A WHO statement stated: "The possibility of infected persons contaminating commodities is very low, and the risk of contracting new coronavirus from packages that have been moved, transported, and exposed to different conditions and temperatures is also very low."
According to the current cognition of the new coronavirus pneumonia, its main transmission route is through respiratory droplets and contact transmission. There have been no reports of infection with new coronavirus pneumonia due to receiving express delivery.
Previously, preliminary research by Alex Chin and colleagues at the University of Hong Kong was published on the preprint website medRxiv. They found that the virus was highly stable for a long time at 4 ° C.
27 ℃ "
At room temperature, if not treated, it can survive at a high level for 7 days, but will be eradicated after 14 days. When it is incubated at 27 ° C (body temperature), it will decrease after 24 hours and cannot be detected afterwards.
Scientists said: "Incubating at 56 ° C for 30 minutes or at 70 ° C for 5 minutes has not found any infectious virus."
"On the surface of the printing paper and paper towels, after 3 hours of cultivation, we found no infectious virus on these surfaces."
In addition, virologist George Lomonosov also told the British media that the risk of viruses spreading in newspapers is very low because they are “quite sterile” during printing and production.