Review the graph showing the effect of antibiotics on the microbiome in the module slideshow. What conclusions can you make from the figure showing bacterial species vs. amount of time since antibiotic consumption? The gut flora was able to regain its former microbial diversity 2 years after a round of antibiotics. The gut microbiome consisted of a single type of Bacteroides species for 9 months after a round of antibiotics. Broad spectrum antibiotics, such as clindamycin, have little effect on microbiome diversity, and therefore, any of the functions of the microbiome such as calibrating the immune system. All of the above