Sci-fi about an ancient sentient virus

[Spookygirl]

Archaeologists discover the body of a prehistoric man sealed in a cave. The man’s body contains a virus which is released when the cave is unsealed. When the viral level in an infected human’s blood becomes a certain level, they are able to communicate with the virus. The virus says that it created all our childhood diseases to strengthen our bodies to make us carriers for the virus.

[Kris]

Spookygirl, that's a good start. Please add more plot details to the topic header (title). We have thousands of book requests.

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[Joseph]

Maybe Darwin's Radio, by Greg Bear?