DNA

Perhaps the integration of exogenous DNA into the human genome is on-going and purposive.
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The great epidemics of  previous agricultural civilizations may have contributed important genes
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Genes bearing adaptive utility for humans living in dense populations 

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Humans living and carrying out civilized lifestyles.
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In particular, non-lethal viral diseases like measles, mumps, and chicken pox
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Which were pandemic until the era of vaccines
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These might comprise an important alternative transmission system for genetic material.
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Perhaps they are our symbiont's

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Having adapted with us into a mutually beneficial relationship.
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If so, eliminating them could be dangerous.
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The precise consequences are hard to predict
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Perhaps though it has something to do with the alarming rise in autoimmune diseases and allergies over the past thirty years.
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Yes we should proceed with care

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Playing with things we do not understand is necessary to advance science and our understanding
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It is also fraught with danger
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Dangers that might not be clear for many years
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Like the current alarming increase in autoimmune diseases.
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Diseases that the medical establishment likes to look at one by one
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In isolation from each other.
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Ever reductionist
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Not wanting to view the scene holistically
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Not wanting to observe the patterns emerging.
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Stuck behind walls of so called specialisation
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What a price we are paying
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An explosion of problems relating to our previous actions.
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Actions taken without thought of their relationship to other parts of the system
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Our ignorance of how everything is interdependent
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Nothing is unrelated and yet medical science still behaves as if they are.
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By definition this must create ever more problems .
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Sadly this is already apparent.