“It sounds like this family has some underlying vulnerability to Covid-19, even if it isn’t one of the well-known “co-morbidities.”
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Yes, as with quite a few diseases, it’s possible that there is an unknown genetic susceptibility. Based upon the following excerpt it appears the dead are a mother and two (presumably) biological daughters:
“She passed away from COVID-19 last week. Days later, her mother, Connie, and sister, Bonnie, followed.”
The vaxx killed them. If they were not vaxxed, the story would be pushing that fact.