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2 questions
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What is the minimal infectious dose (MID) of SARS-CoV-2?
Assuming the immune system is healthy,
How much SARS-CoV-2 virus (cause of COVID-19) is required to make a person sick?
This might also depend on time, if it was a high infectious dose but just some ...
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3
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Is it possible for humans to be resistant to certain viral infections without having specific antibodies in their blood?
Popular understanding of how viruses work split immunity into four categories:
Virus doesn't affect humans at all
No immunity - will get worst possible infection, seems to be the case with COVID-19
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