Files in this Data Supplement:

• Supplemental file 1 - Materials and methods for nucleotide sequence analysis, legends for tables and Fig. S1, and figures showing discriminatory powers and reproducibilities over all identity cutoffs (Fig. S2), false-positive and false-negative rates (Fig. S3), a dnaE neighbor-joining tree (Fig. S4), and the relationships between genotype dissimilarity and geographic distance and temporal separation (Fig. S5).
  Zipped MS Word document, 622K.
• Supplemental file 2 - Figure with dendrogram of all fingerprints (Fig. S1).
  Zipped JPG file, 3MB.
• Supplemental file 3 - Tables showing numbers of isolates collected by site and month (Table S1); data for isolates used in the study, with genotypes (Table S2); environmental parameters for all sampling events (Table S3); and latitudes, longitudes, and pairwise distances of sampling sites (Table S4).
  Zipped MS Excel file, 43K.