: What are the effects of repeated sub-infective doses of coronavirus? There are experimental records and clinical observations showing that exposure to sub-infective doses of some pathogens can result in enhanced immunity

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What are the effects of repeated sub-infective doses of coronavirus?
There are experimental records and clinical observations showing that exposure to sub-infective doses of some pathogens can result in enhanced immunity to infection when exposed to an infective dose of the same pathogen later. In vitro studies show that T-cell immunity can be a key role player in this process and antibody production may be minimal or absent.

What is known about the acquired resistance to COVID-19 in people who are exposed to repeated sub-infective doses?

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