> people didn't like the idea that there could be a parallel infection going around That sounds like fearmongering though. This is a combination of at least t

> people didn't like the idea that there could be a parallel infection going around That sounds like fearmongering though. This is a combination of at least two (if not more) unlikely factors happening in the same person. One of the is prior exposure to a pathogen, one of them is having the right kind of gene, and this study can't rule out other additional factors. The pathogen is likely to be something which has been with the human race for thousands of years, not anything novel to the human race like SARS-CoV-2. There's no point in trying to change your behavior to avoid trying to contact this other pathogen. The pathogen may also be something incredibly common, but other accidental factors conspire to produce this exact antibody.