Here is a representation of how COVID-19 spread around the world:
https://www.dailymail.co.uk/news/article-8164235/US-coronavirus-Map-shows-eight-strains-raced-world.html#v-6615801894722125054
I have two observations about this:
1. Since most travel today is by airplane, that must have been the chief means of the spread of the virus.
2. Even if the virus had NOT apparently started in China, it still would have spread globally. The US, for example and unlike most other nations, has STILL not limited air travel to the degree necessary to prevent spread of the virus.
In my opinion, the vast majority of international air travel serves no essential purpose, and it should be drastically curtailed.
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