This sounds good, but as of only a few days ago, science still hadn’t come to any conclusion that the anti-bodies do confer an immunity, nor for how long if they do.
No. What in that AP article would lead you to believe that? There are ways to genetically “hardcode” immunity into the major histocompatibility complex (MHC) of the host genome, but that only applies to pathogens that populations have evolved to resist; the SARS-CoV-2 virus has been pretty definitively established to be a novel virus from recent zoonotic transfer. We don’t understand why it affects some demographics and some individuals more virulently than others but it isn’t because some people already had antigen-specific antibodies.
I don’t think we can “deduce” it, but there’s been a lot of thinking in that direction. SARS-COV-2 may be novel, but there’s nothing truly new under the sun.
People really want to believe that illness and recovery confers long term immunity. However, That’s not the case for some other Corona viruses. Plus we keep getting reports of people in China suffering relapses. There’s really no way to check the veracity of the reports.
People are desperate for good news, so we get it. They do Not want to hear that the second phase of the infection, 9 months from the first, turns everyone who got it into a zombie.
There is no question that there are differences in genetic susceptibility between people or whole populations; this is why Eurasians were able to tolerate smallpox as an endemic disease with only occasionally epidemic outbreaks with relatively low morbidity but the virus cut through the geographically isolated Native American and Aboriginal Australian populations like a scythe through wheat, to the point that we can’t even estimate the mortality beyond that it was greater than 90%. There is almost certainly a genetic component that makes some people uniquely predisposed to a severe COVID-19 presentation despite relative youth and lack of underlying condition or co-morbidity. And it is unsurprising that the identifiable immunoglobulin binding protein could be common between the SARS-CoV(-1) and SARS-CoV-2 viruses given that both viruses are identified as common from a recent common lineage. But the question posed by the o.p. was “Can we deduce that there may be an antibody for this virus already in the genetic code in a portion of the world population? Passed on from ancestors?” There is no evidence that I’ve seen to indicate that antibodies that attack the SARS-CoV-2 virus are part of the class of natural antibodies that are produced by the immune system from the host’s genome.