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by aroch 4192 days ago
As mentioned by acomjean, fecal transplant (FMT) is the typically how we restore "healthy" biota in the gut. Interestingly, only a handful of species play a large role in the regulation of gut microbiota and physiology/psychology of the host. Recolonizing the gut with these species alone is enough to restore a "healthier" mix.

[1] http://dx.doi.org/10.1016/j.cell.2013.11.024