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This is actually an important term and refers to the fact that we see certain parts of the country have aggressive attacks followed by a lull and a later aggressive attack.
We can predict hotspots by looking at COVID-19 tests.
An increase in the percentage of tests coming back positive is the first clear sign of cascade into chaos. That statistic, if left unchecked, eventually leads to more hospitalizations and ultimately more deaths several weeks down the road.
This summer, we have seen this happen in the South and in the West.
We are now concerned about a rise in the Midwest.