To quote from your article
Wut? I am somewhat confused, a zoologist used computer modelling to show that 10% Europeans are resistant to HIV due to the black death which he thinks was an Ebola virus rather than the black death...
Might be a lot of background reading required to ascertain what I think regarding that. Either way, probably not that important in current events.
Black death was caused by a bacteria... not a virus, specially the bacterium Yersinia pestis
However it is possible that survivors possess a heightened (general) immune system for coping with other diseases.
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