It seems likely that the US would still see waves over much of the winter. South Africa has a population of about 60 million, fairly dense compared to the US.

It seems likely that the US would still see waves over much of the winter. South Africa has a population of about 60 million, fairly dense compared to the US. Compared to the US, their spike and fall would be expected to come on faster (and drop faster). The US is more spread out but with many more people. So its great to know that local spikes would come and go fast, it still is a very acute strain likely to be spread over months as it travels around the country.