These findings are shared for research purposes and indications for decision makers to help them broaden perspectives and expand understanding until they materialize in a reviewed paper.

1) Density is another driving factor and calls for attention as in vacation times, density of regions change thus exposing naive populations who have had limited exposure to the virus.  This maybe limited when it happens in summer, with some possible protection from sun and many open air activities. As 2 driving factors may mitigate each other.


2) Situation is different if peoples pend increasing time  in closed places possibly aggravated by recycled air or A/C where clusters may form.


3)  Authorities and people should consider all alternatives to confined mass transport which may favor this epidemic and future ones beyond masks’ eventual relative protection.


4) Authorities and companies may want to consider improving air circulation with renovated fresh air such buildings to protect their employees and even gain productivity for this epidemic and possible future ones including influenza

T SMIEZEK G LAZZARI M SALATHE show how improving air change rate in buildings may « correspond to a vaccination coverage of 60–70% for an efficacy of 40%, 50–60% for 60% efficacy, and 40–50% for 80% efficacy. In the aerosol model, consistently improved ventilation beats vaccination even with full coverage if efficacies are low. »

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