It turns out that low relative humidity, of the sort that one would see as heating season starts in September, has a major impact on increasing the transmissivity of Covie-19.
This is common in Viruses (Viri?), and exactly the opposite of what one would see in bacteria.
We are in for a bumpy ride: (From the abstract)
There is growing evidence that climatic factors could influence the evolution of the current COVID‐19 pandemic. Here, we build on this evidence base, focusing on the southern hemisphere summer and autumn period. The relationship between climatic factors and COVID‐19 cases in New South Wales, Australia was investigated during both the exponential and declining phases of the epidemic in 2020, and in different regions. Increased relative humidity was associated with decreased cases in both epidemic phases, and a consistent negative relationship was found between relative humidity and cases. Overall, a decrease in relative humidity of 1% was associated with an increase in cases of 7–8%. Overall, we found no relationship with between cases and temperature, rainfall or wind speed. Information generated in this study confirms humidity as a driver of SARS‐CoV‐2 transmission.
This also explains why outdoor protests have not contributed in a significant way to the outbreak.
You don’t see the low humidities that you you do in at outdoor protests as you might, for example, in an indoor event facility like the Bank of Oklahoma Center where Trump held the rally that killed Herman Cain.