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21st century respiratory virus epidemics: SARS: Guangdong, China, 11/2002 MERS: Jeddah, Saudi Arabia, 6/2012 Covid-19: Wuhan, China, 12/2019 Spot the common factor: very low relative air humidity.https://twitter.com/wrathofgnon/status/1230382802857680898 …
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?
Dec and Feb are drier with departure of monsoon season. April to Sept, humidity is brutal.
Wuhan on a river surrounded by lakes...
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