Another study confirming there is no such thing as asymptomatic or presymptomatic transmission of THE VIRUS!!! But... I predict, without any scientific analysis or study, that these facts won't make a scintilla of difference to the Safety Cultists who will continue to demand everyone wear a mask, anti-social distance, limit gatherings by number and who is allowed, shut down or restrict businesses, etc. etc. etc. Why would they suddenly go sane?
https://web.archive.org/web/20201228015353/https://alachuachronicle.com/university-of-florida-researchers-find-no-asymptomatic-spread/University of Florida researchers find no asymptomatic or presymptomatic spread
December 22, 2020
UF Dept of Biostatistics, 2004 Mowry Rd, Gainesville, FL
Four researchers from the University of Florida Department of Biostatistics co-authored a study published online by the Journal of the American Medical Association. They performed
a meta-analysis of 54 studies looking at the household secondary attack rate of SARS-CoV-2. According to the CDC, the secondary attack rate is the number of new cases among contacts divided by the total number of contacts.
The researchers confirmed that SARS-CoV-2 is more contagious than other coronaviruses, with a secondary attack rate of 16.6% (95% CI 14.0%-19.3%) compared to 7.5% (95%CI 4.8%-10.7%) for SARS-CoV and 4.7% (95%CI, 0.9%-10.7%) for MERS-CoV.
Their findings also confirmed the attack rate is higher to adult contacts compared to child contacts and to spouses compared to other family members.
The secondary attack rate for symptomatic index cases was 18.0% (95% CI 14.2%-22.1%), and
the rate of asymptomatic and presymptomatic index cases was 0.7% (95% CI 0%-4.9%), “although there were few studies in the latter group.”
The asymptomatic/presymptomatic secondary attack rate is not statistically different from zero, and the confidence interval is technically 0.7 ± 4.2, resulting in a range of -3.5%-4.9%, but attack rates cannot be negative, so it is truncated at 0.
Here's the paper:
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2774102Household Transmission of SARS-CoV-2
A Systematic Review and Meta-analysis