
The novel coronavirus has a high mortality rate (over 1% for patients older than 50). This could be only partially ascribed to other comorbidities. Possible explanation could be something which assures the ability to prompt response to SARS-CoV-2 in younger people independently from the novelty of the virus itself. Something stimulated the immune system and it scattered immunity against more antigens. The only external stimulation, which healthy people receive, is vaccination (i.e. diphtheria, tetanus, and pertussis (DTP) vaccine). One hypothesis is that vaccination develops the specific immunity but generates a sprouting immunity against antigens in transit. The underlying immunological phenomena are "bystander effect" and "trained immunity"...
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