BEST OF THE WEB: Actual science: University of Florida researchers find no asymptomatic or presymptomatic spread of Coronavirus

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.