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Study finds an unexpected link between farming and immune system evolution

Researchers have long theorized that cultural shifts thousands of years ago from hunting and gathering to agriculture and living in permanent settlements spurred an increase in diseases like smallpox and measles. Compared to hunter-gatherers, farmers stayed put, living close to one another and their animals.  This, it's hypothesized, made it easier for viruses and bacteria to spread among humans or from animals to people. Consequently, it might be expected that the immune systems of people from these farming populations would show more signs of positive natural selection through adaptation to these pathogen conditions.  Read more....

 

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