Since then we have had many comments from different people. One very respected business person who works in life sciences, told us he thought it was a, "multivariate problem," and suggested that, "It's possible, for example, that infection rate would be strongly correlated with people meeting in enclosed areas will less have outside air circulation." He was saying that our analysis might be true but it might not be, "because of the temperature," but because of something that "relates to temperature."
Another doctor said he thought it was because in spring people go outside more and they are less impacted by the dry air of air conditioning systems.
One hospital vice president, whom we highly respect, responded politely, "I do not think that COVID-19 relates to temperature."
Our conclusion on
You can see, then as now, we were certainly not 100% convinced that temperature was the driver or that temperature would save the day. But we do remain optimistic.
As recently as
Updating Data on Temperature vs. Case Statistics - The Situation Now (
On the other hand, we have had people recently coming to us and saying that they've heard that there are more outbreaks in warm countries, like
First off, the cold countries have moved more to the top of the cases list. The top fifteen countries are now all cold countries, as are twenty-two of the top twenty-five countries by case count.
On a percentage basis, today still ninety-six percent of cases have been in cold countries with only four percent in warm countries.
Our definition of cold countries remains unchanged, with a February temperature below fifteen degrees Celsius defining a cold country and above fifteen degrees delineating a warm country. This is because we found the average temperature in
On the other hand, what the people have said to us is certainly true. Some warm countries have seen outbreaks that are hard to ignore.
Please refer to the charts which illustrate this information.
Chart #1: Percent of Cases in Cold vs. Warm Countries (updated
Chart #2: Top Twenty-Five Countries by COVID-19 Cases (updated
Countries and Regions That Have Beaten The Virus
The warm countries of
After all,
The Effect of Testing
What about the effect of testing? There is some thinking that the second order things we?ve talked about are also important. For instance, it might be possible that there is more testing in cold countries than warm countries. We haven't found reliable data on this for all countries, which would be required, but it is a reasonable thing to consider. Note that we did show a consideration for this by doing a per capita GDP analysis, below.
Cold vs. Warm Country Populations
One reader told us they thought there might be more cold countries in the world or more people living in cold countries. We looked at that but concluded that there are only forty-seven percent of the people living in cold countries, whereas fifty-three percent of the people live in warm countries. So, if anything, this should have counteracted the high percentage of cases in cold countries.
Northern Hemisphere vs. Southern Hemisphere Populations
Another reader asked us about what will happen to the Southern hemisphere in July and August. So, we decided to do that analysis as well.
However, on a further analysis we found that much of the rest of the southern hemisphere population will actually be defined as warm even in the months of July and August. To wit, only nine southern hemisphere countries, representing 2.7% of the world's population will be colder than fifteen degrees, and classified as a cold country in the month of July. July is typically the coldest month of the year in the Southern Hemisphere. If we were to include northern hemisphere countries that will still be below fifteen degrees in July, such as
Chart #3: Percent of Global Population Living in Countries that will be Cold in July
The Effect of Per Capita GDP on Case Counts
Further thinking about "second order considerations" we wanted to look at GDP to see if maybe the colder countries had higher per capita GDP and this was leading to higher COVID-19 case counts. One might argue that this would have led to more travelers to the cold countries, a situation where better healthcare exists, and a situation where more tests have been conducted.
All of these are certainly possible and would push against the idea that temperature itself, or some corollary of temperature is supporting the lower case counts in warm countries.
We looked at GDP in cold and warm countries and found that cold countries have a higher average per capita GDP. In fact, sixty-seven percent of the world's per capita GDP is in cold countries and thirty-three percent is in warm countries. So, this GDP factor is certainly one that cannot be completely ignored.
It is indeed a possibility that the virus simply spread "first" in cold countries and it will spread in warm countries next.
Still, we feel that 96.0% of all cases being in cold countries can't be seen as insignificant at this point.
Conclusions
So, what does all of this mean? Does it show that the virus only spreads in cold countries? Does it show that the summer will stop the spread in
We think that the numbers are telling us four things
A. The spread seems to be faster in colder weather (for whatever reason),
B. The virus can spread in warm countries but seems to spread slower (for whatever reason),
C. The virus can be "beaten" in both warm and cold countries with the right intervention,
D. The summer months are likely to "help" the slow of the spread at least for a few months in
Separately we think that data is showing that countries that test and treat coronavirus patients in separate "coronavirus only" facilities do much better at containment. Protecting elderly in hospitals and in retirement homes is vitally important to success. This is a topic for another article.
Comments about our analysis are welcome at the email below.
About Azabu Insights
Azabu Insights is a boutique strategic consulting company based in Azabu Juban,
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