Editorials
Asymptomatic transmission of covid-19
BMJ 2020; 371 doi:
https://doi.org/10.1136/bmj.m4851 (Published 21 December 2020)Cite this as: BMJ 2020;371:m4851
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; viable virus is relatively short lived.
7 Symptomatic and presymptomatic transmission have a greater role in the spread of SARS-CoV-2 than truly asymptomatic transmission.
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The transmission rates to contacts within a specific group (secondary attack rate) may be 3-25 times lower for people who are asymptomatic than for those with symptoms.
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eli presymptomatic ja ''truly asymptomatic on kaks eriasiaa. Eli joojaei. Selkeesti vähemmän mutta mahdollista. Tää saa tukea myöskin tartunnan jäljitys tutkimuksista.
edit. hyvä puoli on että tartunta aika on aika lyhyt. Eli 1pv ennen oireita ja 2-5pv sen jälkeen tartuttaa eteenpäin. 5 pv saattaa olla liiottelua