HCoV感染の影響については相反する見方があって…

https://www.ijidonline.com/article/S1201-9712%2821%2900171-5/fulltext
>Prior infections with seasonal coronaviruses may protect against critical COVID-19.

https://www.tandfonline.com/doi/full/10.1080/22221751.2021.1905488
>HCoV-OC43 S-IgG titres were significantly higher in patients with severe disease than those in mild patients at days 1–21 post symptom onset (PSO).

相同性からすると…

https://www.nature.com/articles/s41467-021-21240-1
https://media.springernature.com/full/springer-static/image/art:10.1038%2Fs41467-021-21240-1/MediaObjects/41467_2021_21240_Fig4_HTML.png