I have also heard that people with diff blood groups can get diff levels of symptoms. So it may be that an OH or child show no symptoms as diff biology.
Where did you get this information from?
Read a long time ago now. (Can't find original article)
Loads on Google search... (Surprised no reference in here already!)
https://figshare.com/articles/How_blood_group_O_could_be_protected_from_Coronavirus_Covid-19_infections/12019035
@Ordinata started
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Where did you get this information from?