For those that still believe the "experts" on what we need to do (wear masks, avoid large gatherings, etc.). Here is a
WHO report from 2019, on non-pharmaceutical interventions for pandemic management. Some highlights from the summary (p. 99):
Personal hygiene measures such as hand hygiene, respiratory etiquette and face masks are widely used as non-pharmaceutical intervention measures to reduce the risk of acquiring or spreading respiratory infections, and for mitigating pandemic influenza. However, our review identified a lack of compelling evidence for the effectiveness of hand hygiene, respiratory etiquette and face masks against influenza transmission in the community. There are still gaps in the evidence base which further research would help to fill.
Ten RCTs were included in meta-analysis, and there was no evidence that face masks are effective in reducing transmission of laboratory-confirmed influenza.
Avoiding crowding including separating people into small groups or cancelling public gatherings is an effective intervention to prevent the spread of influenza. However, the effects of measures to avoid crowding in reducing transmission is uncertain.
All of the interventions that are now necessary and mandatory in these difficult tiems, were thought to be completely ineffective merely one year ago (!).
Makes sense, doesn't it? Biology is very different in 2020.