Prospective surveillance analysis of recent ST1, ST2, ST3, and ST204 isolates. Recent isolates collected in the last 1 month are compared with isolates collected in the preceding 12 months, with the analysis repeated every month. Historic isolates collected >12 months ago are also included for context. After comparison, recent isolates are labeled as likely to be linked, possibly linked, or unlikely to be linked. The results are interpreted together with epidemiologic information to refine relationships and potential links. Maximum-likelihood phylogenies based on core-genome SNPs are shown for MLST 1 (using the reference genome F2365; BioSample accession no. SAMN02603980), MLST 2 (reference genome J1-220; BioSample accession no. SAMN01813900), MLST 3 (reference genome R2-502; BioSample accession no. SAMN02203126), and MLST 204 (draft genome assembly of local ST204 isolate).