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Mice raised in a germ-free environment have improved health measures and longer average life span:

http://dx.doi.org/10.1016/j.chom.2017.03.002

Not all pathogens are equal; cytomegalovirus may be far more important than the rest:

https://doi.org/10.3389/fimmu.2017.01953

And historically, reducing the burden of infectious disease already has increased life expectancy and reduced/postponed incidence of age-related disease:

http://www.slate.com/articles/health_and_science/science_of_...




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