I can't find any explanation of why this is occurring, but South Korea again leads the world in most covid cases during the past week.  This has been going on for more than a month now.  From  Worldometer , new cases this past week: World  272,971 #1  South Korea  210,672 (77%) #2  USA  32,537  (12%) Covid deaths during the past week: World  590 #1  USA  129 #2  Brazil  116 #3  S. Korea  71 Mortality rate average this past week: World  0.2% USA  0.4% Brazil  1.2% S. Korea  0.03% Covid deaths/million population: #1    2    Australia, New Zealand, Costa Rica, Malta. #5    1    S. Korea, Canada, Croatia #12  0.4  USA, Guatemala, Romania, Norway How does one make any sense of these differences?  Take mortality rate, for example. The annual mortality rate of the seasonal flu is around 0.1%. With all the vaccinations and infections, the mortality rate of covid, which was at 1% for much of the first two years, has dropped to 0.2% for the world and 0.4% for the USA. But Brazil remains arou