Like if just one viral particle gets into your system, what’s more likely to happen: it proliferates undetected and cause an infection, or the immune system eliminates it before it can do so?
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There are some questions that have perfectly natural, real-world answers, but nobody knows the answer. This question is statistical and involves a complex, microscopic system. Scientists aren’t going to inject a single virion into a person one day at a time until they get sick – and short of doing that, there may be no way to know.
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