Spain did an extensive study involving 60,000 people and estimate that only 5% of the Spanish population had antibodies against the coronavirus.Just to point out, the states with ultra high infection rates in the beginning are now the ones being the better state for infections, makes you wonder about herd immunity as some people dismiss.
Coronavirus: Spanish study casts doubt on herd immunity feasibility
A Lancet study estimates that around just 5% of the Spanish population has developed antibodies.
www.bbc.com