I have only a rudimentary understanding of DNA replication from first semester biology, but my reccolection is that the "machinery" to support replication exists inside cells, and even a small strand of DNA is too large to cross cell walls, isn't it? So my understanding is that free DNA in the blood stream would not be replicated.

What you describe sounds like the PCR method mentioned above, but it sounds like they've only fairly recently found an exotic bacterium that will actually do this, and it requires extreme temperatures to do it efficiently...

I could easily be completely confused though.

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