Four puzzling coronavirus facts

1. Why are we not seeing more problems in Iran if so many people have it?

2. Why is nowhere in the world (with the possible exception of Iran) currently as bad as Northern Italy?

3. Why did Singapore’s containment strategy work, in such a high-density location?  Their program is mostly symptom/temperature checking-based, but supposedly a lot of transmission happens before any fever manifested.

4. Why isn’t China seeing a second wave?  There aren’t nearly enough infections for herd immunity to be reducing R0.

Is climate really the main/significant source of heterogeneity here?  Or is it that Italians (and Iranians?) kiss each other when they greet and then hold long “street conferences”?


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