@bubu12
 
 

https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)32651-9/fulltext#coronavirus-linkback-header

Infectivity of asymptomatic versus symptomatic COVID-19

628 people with COVID-19 were included in this analysis (appendix). 3790 people were close contacts of an index case and were quarantined. On average, 6·0 people from the community were quarantined per index case. Overall, 89 (2%) of 3790 close community contacts developed COVID-19 while in quarantine. Of these, 50 (56%) of 89 contacts were quarantined because of an asymptomatic index case, whereas 39 (44%) contacts were quarantined because of a symptomatic case.43 (48%) contacts were quarantined because of a seronegative index case, whereas 46 (52%) were quarantined because of a seropositive index case.

50 / 3.790 = 1,31%