Fig. 2

Taxonomic and functional characteristics of bacteria that exhibit strain sharing between donors and recipients of fecal microbiota transplants. B Family-level structure of bacterial taxa that were shared at the strain level between subjects. Bar chart of species, grouped into families, that exhibit strain sharing between matched (left) or mismatched (right) pairs, based on a 99.999% ANI threshold. Colors reflect different bacterial families and are scaled to represent the relative proportions of strain sharing events in each category. B Population prevalence in donors and pre-FMT recipients. Each strain sharing event was annotated according to the initial prevalence of the species to which it belonged. The x-axis represents the number of donors or pre-FMT recipients containing the species (of a maximum possible of 13); the bar color represents the dyad type. C Anaerobic metabolism across varying definitions of transmission. Each strain sharing event between matched pairs was annotated, at a species level, as aerobic, anaerobic, or mixed. D Host specificity across varying definitions of transmission. Each strain sharing event between matched pairs was annotated as a genus reported only in humans or reported in multiple species