The problem is the confirmed cases are the primary part of determining efficacy. The people who do not get the virus have a smaller impact on that statistic at

The problem is the confirmed cases are the primary part of determining efficacy. The people who do not get the virus have a smaller impact on that statistic at higher numbers. EDIT: User runamok explains it well. [1] https://www.cdc.gov/chickenpox/outbreaks/downloads/appx-f-inv-outbrks.pdf https://www.cdc.gov/chickenpox/outbreaks/downloads/appx-f-in...