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Relative humidity, especially indoors, when rooms are heated (such as schools, hospitals, etc.) without any humidifiers...
Pretty sure much of Guangdong doesn't have heaters at all. They just wear coats inside when it gets cold. I think we need a new theory here...like wet markets?
More and more of Guangdong homes have heaters.
Brazil got a lot of wet markets too, and i dont see the same phenomenon happening, and btw most of the coastline (where most of the population lives) is quite humid because of a thing called "maresia"
This phenomenon = emergence of new viruses, in fact, right now in Brasil we are facing a dengue epidemic too (high humidity and lotes of still water)
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