If you think of someone handling that meat or undercooking it, you can obviously pick up those organisms and/or, as Dr. Patrick said, the genes carried on them, and then you have them enter into the microbiome within your own intestinal flora, which is a very rich source of germs in the body.
Ceux-ci se retrouveraient alors dans le microbiome de la flore intestinale, une source très riche de germes dans le corps humain.