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The above table shows the five countries - from the five different continents - are topping the current list of the total number of cases thus far (as of 7/24). The US continues to be the front-runner with 4.25M cases, followed by Brazil (2.35M), India (1.34M), Russia (800K), and South Africa (422K). The fact that the top five countries represent five different continents makes this pandemic a truly global one.
The correlation matrix shows that while the USA has high collinearity with India and South Africa and moderately high correlation with Brazil, it has a high negative correlation with Russia. In fact, Russia has negative correlations with all four countries. The reason is simple: While the daily cases of Brazil, India, South Africa, and the US are rapidly rising, Russia has been trending down. This inverse relation has generated negative correlation coefficients.

Brazil -- Brazil's pandemic nightmare has been an open secret. It has 2.35M cases, with a death toll of 85K. The daily average caseload was 14,118 in May, doubling to 29,572 in June, and further elevating to 38,497 in July. At 48%, it has one of the highest positivity rates in the world. Being located in the Southern Hemisphere it has also run into the winter flu season, resulting in a double whammy.

India -- Of these five countries, India's chart is the most awful. Though the slope is not an exponential one yet, it has already broken past the linear trend, making it look all the more appalling. The rapid change in the slope can be explained by the change in the daily average caseload from May to July: The daily average caseload in May was a mere 4,893, skyrocketing sixfold to 29,208 in July. The monthly death toll also jumped fourfold between May and July, from 134 in May to 564 in July.
Russia -- After having peaked in early May, Russia's daily cases have been steadily declining. The daily average caseload in May was 9,714, declining to 6,400 in July. The death toll has moved up slightly from 117 in May to 155 in June/July. Of course, Russia has done a great job in testing, thus achieving one of the best credentials in the world.
South Africa -- Though South Africa's trendline resembles that of India's, it nonetheless lacks the expanse of its counterpart's. The daily case average of 891 in May grew thirteen-fold to 11,167 in July. The death toll also grew eightfold during that period, although South Africa has one of the lowest death rates in the world. Unfortunately, its positivity rate has been climbing, causing serious concerns in some of its densely-populated cities like Johannesburg, Cape Town, Durban, etc.

The USA -- Though the initial outbreak in the US had tapered by mid-June, a powerful resurgence in the Sunbelt -- particularly Arizona, California, Florida, Georgia, and Texas -- has renewed its place at the top of the chart. In fact, as of today, California has eclipsed New York in total cases, the original epicenter of the outbreak in the country. Florida and Texas now occupy third and fourth places. The daily death toll has also been climbing, forcing many states to return to the partial closure of businesses and restoration of mitigation measures like face-coverings, curfews, etc.
Stay safe!
-Sid Som
homequant@gmail.com