Seems unlikely, more probably false-negatives, the antibody tests are very new of course. But if someone genuinely doesn't have antibodies, they won't be immune to the virus, so those people shouldn't be accounted for in the 'herd immunity' statistics anyway.
We also don't know that much about how these studies got their sample - if they were from blood donors, for example, that tends to be a self-selecting healthy group of the population.
Not quite as I understand it - suggestion some people using T-Killer cells or another of various means to kill off the infection, without the need for antibodies. The chap on here - sorry I’ve forgotten the name - who has a degree in Biology seemed to think that immunity via T-Killer cells would still exist.
Also the Rutherford survey - and the first Stockholm one - suggested the numbers were too high of this type to be all (or even mostly) false negatives. And if so, the South Korean tests are utter shit, which looks unlikely given how they are doing.
Still so much to learn about this virus.
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