FIG 2.

Examples of participant phylotypes. (a and b) Participant 2, who was enrolled in both years of the study, was type IV (diversity) in year 1 (a) and transitioned to type II (L. gasseri) in year 2 between weeks 3 to 4 (b). (c and d) Participant 10, who was also enrolled in both years, was type III (L. iners). (e and f) Participant 4 (e) was type I (L. crispatus) with relatively higher diversity, while participant 11 (f) was also type I with low diversity. Red triangles indicate days on which the participant reported menstruation. Black lines indicate the college’s spring break, when samples were not collected.