> As I see it, there are so few cases in California because of the measures that have been taken.

California has been spared because it's not in the Covid Belt. That's a term I've come up with to describe the ideal climate that SARS-CoV-2 thrives in. All hard hit regions exist in the Covid climate belt.

Not all the least hit areas (eg South Korea) exist outside of the Covid Belt. You can also limit its spread with other aggressive measures. Climate provides a substantial natural impediment, although it doesn't entirely stop the spread either. It's why Texas, New Mexico, Arizona look like they do right now versus Michigan and New York. It's not because Texas has had amazing testing and tracing and quarantine measures.

It's why Tehran was hammered by the virus but Baghdad was not. It wasn't luck, it wasn't testing, it wasn't tracing, it wasn't lockdown measures. Baghdad is a hotter climate than Tehran during the December > May time frame.

It's why Athens & Greece is largely spared but Milan is not. It's not because Greece implemented South Korea-style measures early on and they have a far better healthcare system than Britain. It's why Southern Italy is not hit like Northern Italy. They have different climates.

It's why Madrid is hit so hard but Barcelona and Lisbon are not. They have different climates.

It's why NYC is hit hard but San Francisco and Los Angeles and San Diego are not.

The entire San Diego County has 53 deaths.

It's why Texas is largely spared but Massachusetts and Michigan are not.

It's why Detroit was hit but Phoenix was not.

It's why Belgium and the Netherlands were hit but Mexico wasn't.

It's why Wuhan was hit but Hawaii and Jakarta and Singapore were not.

It's why Algiers (7.8m people in their metro, just south of Spain) isn't drowning in Covid cases and hasn't been hit like Madrid.

It's also why India and Pakistan have been largely spared bad outbreaks. Defying all predictions thus far to the contrary.

It's why Lagos Nigeria isn't being hit hard and the Netherlands and Britain were.

It's why Cairo isn't buried in dead bodies right now. The Cairo metro has 20 million people. Check out the temps in Cairo during the Nov > May time frame.

Look at the climates. Nearly all of the hardest hit areas exist in a sweet spot on temperature range.

Milan: https://weather-and-climate.com/uploads/average-temperature-...

Wuhan: https://weather-and-climate.com/uploads/average-temperature-...

NYC: https://weather-and-climate.com/uploads/average-temperature-...

Tehran: https://weather-and-climate.com/uploads/average-temperature-...

London: https://weather-and-climate.com/uploads/average-temperature-...

Boston: https://weather-and-climate.com/uploads/average-temperature-...

Chicago: https://weather-and-climate.com/uploads/average-temperature-...

Now compare to

Baghdad: https://weather-and-climate.com/uploads/average-temperature-...

Cairo: https://weather-and-climate.com/uploads/average-temperature-...

Los Angeles: https://weather-and-climate.com/uploads/average-temperature-...

Algiers: https://weather-and-climate.com/uploads/average-temperature-...

Lagos: https://weather-and-climate.com/uploads/average-temperature-...

Houston: https://weather-and-climate.com/uploads/average-temperature-...

Phoenix: https://weather-and-climate.com/uploads/average-temperature-...

Singapore: https://weather-and-climate.com/uploads/average-temperature-...

Las Vegas: https://weather-and-climate.com/uploads/average-temperature-...

San Diego: https://weather-and-climate.com/uploads/average-temperature-...

Athens: https://weather-and-climate.com/uploads/average-temperature-...

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Compare Barcelona: https://weather-and-climate.com/uploads/average-temperature-...

To Madrid: https://weather-and-climate.com/uploads/average-temperature-...

Compare Milan again:https://weather-and-climate.com/uploads/average-temperature-...

To Rome: https://weather-and-climate.com/uploads/average-temperature-...

See those higher highs through the flu season? That 8-10 degrees of higher temps throughout Winter is the difference. Getting as close to the ~55-60 F or higher temp zone at the highs as possible during Winter is where you want to be. The regions that are, have seen dramatically fewer cases. This spans all variations of circumstances between nations (rich vs poor, good testing vs weak testing etc). At 64 degrees F and above, we know that influenza, for example, is heavily impeded by the heat.

This is why so many experts have been predicting a big downturn in the virus as Spring & Summer temperatures roll in.

This has already been shown by several studies. We already know why. 90-95% of all cases of transmission have occurred in the Covid Belt areas that have ideal climates for the transmission of the virus (otherwise Africa would be drowning in Covid deaths right now).