VapoursAndSpleen t1_j5imdr1 wrote on January 23, 2023 at 6:48 AM

Reply to comment by essentially in How our microbiome is shaped by family, friends, and even neighbors. Study of the gut and mouth microbiomes of thousands of people from around the world raises the possibility that diseases linked to microbiome dysfunction, including cancer, diabetes, and obesity, could be partly transmissible. by MistWeaver80

A baby in my family was a c-section baby and the doctor swabbed his face with whatever was on mom's genitals in order to inoculate him with whatever helpful bacteria were there. So, it's a thing that is done. As for allergies and stuff, it's coming to be fairly well known that exposure to house pets at an early age reduces the chances of developing allergies to animals and some other stuff.