eli5 Why does our immune system not attack viruses during “incubation period”?

Question

eli5 Why does our immune system not attack viruses during “incubation period”?

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Answer 1

During the incubation period there isn’t enough virus in your system for your brain to be alerted to the problem. During that time, the virus is replicating while it’s slipping under your body’s radar. Once enough of the virus exists in your system, your body will alert your brain to the “invasion” and your brain will direct your immune system to mount a defense. Until then, your brain doesn’t realize it’s there.