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完整標題：
Coronavirus can persist in air for hours and on surfaces for days: study
發稿單位：路透社 英文版
發稿時間：March 18, 2020 / 3:41 AM / Updated 13 hours ago
撰 稿 者：Gene Emery
原文連結： https://reut.rs/2UhtOKK
https://www.reuters.com/article/us-health-coronavirus-study/new-coronavirus-
can-persist-in-air-for-hours-and-on-surfaces-for-days-study-idUSKBN2143QP

    (Reuters) - The highly contagious novel coronavirus that has
    exploded into a global pandemic can remain viable and infectious
    in droplets in the air for hours and on surfaces up to days,
    according to a new study that should offer guidance to help people
     avoid contracting the respiratory illness called COVID-19.

    Scientists from the National Institute of Allergy and Infectious
    Diseases (NIAID), part of the U.S. National Institutes of Health,
    attempted to mimic the virus deposited from an infected person
    onto everyday surfaces in a household or hospital setting, such as
     through coughing or touching objects.

    They used a device to dispense an aerosol that duplicated the
    microscopic droplets created in a cough or a sneeze.


    The scientists then investigated how long the virus remained
    infectious on these surfaces, according to the study that appeared
     online in the New England Journal of Medicine on Tuesday - a day
    in which U.S. COVID-19 cases surged past 5,200 and deaths
    approached 100.

    The tests show that when the virus is carried by the droplets
    released when someone coughs or sneezes, it remains viable, or
    able to still infect people, in aerosols for at least three hours.

    On plastic and stainless steel, viable virus could be detected
    after three days. On cardboard, the virus was not viable after 24
    hours. On copper, it took 4 hours for the virus to become
    inactivated.

    In terms of half-life, the research team found that it takes about
     66 minutes for half the virus particles to lose function if they
    are in an aerosol droplet.

    That means that after another hour and six minutes, three quarters
     of the virus particles will be essentially inactivated but 25%
    will still be viable.

    The amount of viable virus at the end of the third hour will be
    down to 12.5%, according to the research led by Neeltje van
    Doremalen of the NIAID’s Montana facility at Rocky Mountain
    Laboratories.

    On stainless steel, it takes 5 hours 38 minutes for half of the
    virus particles to become inactive. On plastic, the half-life is 6
     hours 49 minutes, researchers found.

    On cardboard, the half-life was about three and a half hours, but
    the researchers said there was a lot of variability in those
    results “so we advise caution” interpreting that number.

    The shortest survival time was on copper, where half the virus
    became inactivated within 46 minutes.



對照 八卦板新聞 路透社 日文版

新型コロナ、空中で数時間生存　米研究所が警告
https://jp.mobile.reuters.com/article/amp/idJPKBN214400?taid=5e71543f72e8fa000







當病毒粘附到物體上時，存活時間根據物質的類型而變化，塑料或不銹鋼為3天或更長，瓦
楞紙為1天，銅為4小時。






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