On June 7, Dr. Maria Van Kerkhove, head of the WHO’s emerging diseases and zoonosis unit, told a press conference that from the known research, asymptomatic spread was “very rare.” “From the data we have, it still seems to be rare that an asymptomatic person actually transmits onward to a secondary individual.” She added for emphasis: “It’s very rare.”
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.
This is the point where you might ask where Strike Three is, but if we're going to use the baseball analogy let's flip it around to a challenge to the pro-lockdown Viro Fascists:
Where are any examples of Balls?
