Figure 2.

Phylogenetic relationship of severe acute respiratory syndrome coronavirus-2 sequences, as generated by IQTree with γ-distributed rate differences and 1000 bootstrap validation. All sequences were identified by GISAID accession numbers, with global and Singapore references in magenta and black, respectively. Cases related to Ward I are in blue (Node 18). The scale bar indicates genetic distance between sequences, and bootstrap values are indicated at node branches. Samples from Patient A (index case), Patient B (symptomatic physician), Patient C (primary case) and Patient D (patient from Ward II) are shown.