Talk:COVID-19

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Revision as of 06:20, 14 January 2021 by imported>Gareth Leng (→‎Asymptomatic spreading)
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 Definition:  Disease that results from infection with SARS-CoV-2, a coronavirus that apparently first infected human populations towards the end of 2019; by December 2020, more than 66 million cases of Covid-19 had been reported globally, and it seems likely that this is a considerable underestimate as many cases are asymptomatic, and many others with symptoms were never tested. [d] [e]
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Asymptomatic spreading

It seems that COVID-19 is often spread by persons displaying no symptoms, making it particularly difficult for people to avoid spreading it. What is the best source for this? Could or should this fact to also in the CDC guidance summary list of key facts about the disease? Or has the CDC not spoken on this? Pat Palmer (talk) 20:50, 13 January 2021 (UTC)


There's an excellent editorial in the BMJ on this by Allyson M Pollock and James Lancaster (2020) https://www.bmj.com/content/371/bmj.m4851 Asymptomatic transmission of covid-19. BMJ 2020;371:m4851 Key points:

1) "Earlier estimates that 80% of infections are asymptomatic were too high and have since been revised down to between 17% and 20% of people with infections"

2) It’s unclear to what extent people with no symptoms transmit SARS-CoV-2.

3) Viral culture studies suggest that people with SARS-CoV-2 can become infectious one to two days before the onset of symptoms and continue to be infectious up to seven days thereafter.

4) Symptomatic and presymptomatic transmission have a greater role in the spread of SARS-CoV-2 than truly asymptomatic transmission


- However - "asymptomatic and presymptomatic people may have more contacts than symptomatic people (who are isolating), underlining the importance of hand washing and social distancing measures for everyone"

Gareth Leng (talk) 12:15, 14 January 2021 (UTC)

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