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Would we have any way of knowing if our innate immune system destroyed a pathogen without involving the adaptive?

Could a symptomless person who tests positive for COVID-19 with the RNA test, e.g., later test 'negative' for exposure on the antibody test?

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Generally antibodies are formed, but it is possible that innate immune system has cleared out the pathogen. But antibodies will be formed even after that, as adaptive immune system has received the stimulating signals from helper T cells, which are matured during the innate immune responses triggered by an infection. This signal triggers B cells to produce antibodies. Antibody production is activated because of signals from innate immune system.

So, even if infection is cleared by innate immune system, still antibodies will be synthesized.

Reference:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3399021/

https://medicalxpress.com/news/2020-05-dont-antibodies-immunity.html

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If the innate system is very fast at clearing the pathogen out, the memory B cells, responsible for antibodies production won't be numerous enough to provide with a good immunity.

Reference: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4159104/

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