Fig. (2) Comparison of the subgingival microbiota in subjects D114 and D119 before (a) and after (b) nonsurgical periodontal treatment. Each dot represents the number of a specific sequencing read (matched to a species/phylotype) identified in the subgingival samples. A total of 121 species/phylotypes were shown in the analysis after data were filtered to include only reads that reached a count of >10 in at least one of the 4 samples. Most of the species/phylotypes were detected in both patients (before or after treatment) but their proportions varied between patients.