There are some issues with the Spain report that don't work for me. Other areas of the world which have carried out major testing manage to find far higher antibody rates, e.g. from over half in Bergamo to 14% in Moscow.Herd immunity doesn't appear as if it is anywhere near where we require.
An antibody test in Italy's former coronavirus epicenter has shown more than half of blood samples contain coronavirus antibodies. Researchers said the sample size is large enough to represent all of Bergamo province.
Experts warn that antibodies don't necessarily confer immunity against the infection.
With a population of 8.9 million, the data mean an estimated 1.5 million Londoners have contracted the disease during the crisis and produced antibodies that will fight the virus if they encounter it in the future.
Should only a few percent of people have immunity the virus would immediately reoccur as soon as people left their homes. In the UK we have had nearly 2 months of increasing public contact yet a continuing reduction in rates. This is not representative of a population with an immunity rate of just a few percent. Also still no one has caught it twice.