Dysbiosis & Restoration

Restoration of microbiota dysbiosis induced by antibiotics or other factors through administration of probiotics or fecal microbiota transplantation (FMT) of intestinal commensal bacterial species, such as Escherichia coli and Lactobacillus johnsonii, restores the suppressed adaptive immune functions in humans and mice
Ekmekciu et al. 2017 Front. Cell. Infect. Microbiol. 7: 1-19
Ekmekciu et al. 2017 Frontiers in Microbiology 8: Article 2430
Ren et al. 2017 Hepatology 65(5): 1765-1768

There are different proposals to restore aspects of the ancestral gut microbiota through ‘rewilding’.
Sonnenburg & Sonnenburg 2019 Science 366: eaaw9255

see also:
Fecal Microbiota Transplantation (FMT)
Probiotics (living agents)