Comparison of contact tracing (CT) and genomic clusters. Dots represent individual cases, and lines represent links between initial and secondary cases reported to the CT team. The resulting CT clusters (dots connected by lines) are shown by size and date of positive test. Colors (and letters above cases) correspond to cases matched by sequencing (same genomic cluster). White dots are cases belonging to a single-case genomic cluster (a unique sequence not found for any other case); black dots, cases for which no sequencing was available.