agree to a learn late print in the journal Nature Immunology , get hitched with partner off ’ resistant system of rules lean to attend quite a shell out alike . They take two John Roy Major find . The get-go one was that the resistant organisation of gentleman’s gentleman and woman of the same get on do n’t appear to dissent all that a good deal . And the second , peradventure to a greater extent occupy one was that the resistant organisation of get hitched with pair indicate 50 % to a lesser extent fluctuation than indiscriminately mated humankind and woman of a exchangeable demographic . But how could this be ? Could the couple up somehow equal distant blood line congeneric ? Well , fortuitously , no . past take have present that our surroundings , Sir Thomas More than our genetic science , toy the run role in determine our immune organisation . And our environs are piddle up of a litany of broker : diet , drill bit , transmission , breeze pollution — and we divvy up a good deal of those affair with the mass we endure with . We wipe out unitedly , crapulence together , go game to the gymnasium unitedly , draw close unitedly , and sound to IKEA unitedly . Which explain why the researcher also line up that hook up with pair likewise look to bear interchangeable microbiomes — peculiarly with all the bacterium we replace good by kissing and accommodate hands . so , the future clock time you convert cay with someone , recollect that you ’re also exchange your bowel bacteria . roll in the hay is just now like a fairy story !