Besides that, new cases also fell dramatically from early January in both Europe and South America before ticking up again after February 15th. Both regions were then and still remain far behind vaccination levels in the UK and USA. There must be some other explanation apart from vaccines why cases fell so precipitously.
Damned if I know what it is, save for "seasonality". But it sure as hell ain't vaccines. The US hit the lackluster present day European vaccination levels in the first week of February, and the UK did the same a week earlier, yet daily new confirmed cases were already in free-fall in both.
As vaccinations had nothing to do with the drop in cases in the US, UK, Europe and South America in January, it is likewise doubtful their relative paucity in Europe and South America now has anything to do with the uptick in cases since Feb 15.
