hello and welcome to in good shape do you know what those funny birds and me have in common but tyria on ours surfaces well you think it's kind of disgusting no it's not because those bacteria are very important for our health and well being thank you know what takes care of all bacteria our own immune system. the immune system we know it as a defense system but it has another much broader function. we end our microbial cohabitants need to be kept in balance exactly how the immune system does that is extremely complicated and we don't yet fully understand it it has to react but without overreacting. it can't just rush in and let fly at random it needs to leave its friends in peace for example microbes which help with digestion manufacture vital substances and eliminate pathogens. but how does the immune system know which microbes are the good guys and which are the baddies. as with every system in the body the immune system has regulators that spurred on or slow it down. our microbial cohabitants help with this fine tuning. microbes convince our immune system to let them stay they soo