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1/ I am interested in knowing how much respiratory virus spread is affected by population density. Unclear. Bigger, denser cities get their flu season spread out over more time. But smaller cities have faster spreading outbreaks once the outbreaks start.https://www.citylab.com/environment/2018/10/big-cities-have-longer-flu-seasons-while-small-cities-have-more-intense-ones/572161/ …
The reason why big cities have longer flu seasons is despite density not because of it, imho. They simply have more people. Slightly higher r nought in cities but it takes longer for it to traverse the entire population?
