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       #Post#: 2876--------------------------------------------------
       Transmissibility of COVID-19--presymptomatic transmission is
       possible
   DIR By: agate
       Date: April 16, 2020, 1:40 am
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       The novel coronavirus called COVID-19 can be transmitted by
       someone who has no symptoms yet  but is carrying it.  This is
       one reason why precautions like social distancing, face masks,
       and diligent handwashing are needed.
       From the NEJM Journal Watch (April 15, 2020):
       --- Quote ---
       >
       > Timing of viral shedding & transmissibility:[/size]
       > [/size]
       > [/size]Reporting in [/size]Nature Medicine[/size], researchers
       in China examined viral load data on some 90 COVID-19 patients,
       as well data on the timing of transmission among nearly 80
       transmission pairs (that is, one person likely infected the
       other). Combining these data — and assuming an incubation period
       of 5.2 days — the researchers conclude that infectiousness began
       2.3 days before symptom onset and peaked 0.7 days before
       symptoms began. They also estimate that presymptomatic
       transmission accounted for 44% of secondary cases among the
       transmission pairs.
       --- End Quote ---
  HTML https://www.nature.com/articles/s41591-020-0869-5
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