Fig. 2

Ecological diversity of recurrers’ gut microbiomes recovered significantly more slowly than non-recurrers’. Alpha diversity (Chao index), a measure of species richness, significantly decreased pre- to 1 week post-CDI antibiotic treatment within both recurrent and non-recurrent groups. From one week to two weeks post-CDI treatment, alpha diversity recovered significantly only within the non-recurrent group. Alpha diversity only differed significantly between the recurrent and non-recurrent groups at 2 weeks post-CDI antibiotic treatment, with higher diversity in the non-recurrent group. R = recurrers, NR = non-recurrers