Considering that bacteria are the actual organism that keep us alive, are humans independently alive or only as a member of a microbiome? The Human Microbiome - University of Washington https://depts.washington.edu/ceeh/downloads/FF_Microbiome.pdf Without the help of bacteria a newborn baby would not live to procreate, one of the requirements of living organisms. Some people have to live in a sterile environment because they have no natural defenses against external biological threats. Think about this. Remove our symbiotic bacteria and the human organism dies in a very short time.