re: Sweden projected to reach herd immunity May 1

I'm very skeptical they've reached the threshold to reach herd immunity. Depending on the Ro of the disease (which I've seen varying figures for between 2 and 4), it would take between 50-70% of the country to have been exposed to the virus for them to reach herd immunity, and there would have to be no other methods of transmission other than through respiratory droplets (as in there cannot be an environmental component of transmission). The process of herd immunity, if it is even possible for this virus, is going to take time.