It seems someone in Spain was listening to John Larkin. They did a very ex tensive antibody test of 36,000 randomly selected households and 70,000 peo ple to find only about 5% have been infected. In and around Madrid the inf ection is closer to 10% to 14%. Much less in the rural areas.
So clearly there is no reason to think there is any herd immunity going on.
I hope we can put that idea to bed now. The facts are in, the fat lady has sung.