Fig. 2.
Phylogenetic relationships of SARS virus isolates, including 12 isolates from Taiwan (TW), 16 isolates from other countries, and 1 isolate from a palm civet (SZ3). The neighbor-joining tree was constructed with bootstrap analysis based on the number of mutations in the viral genome, and the bootstrap values are added to the tree. The three clusters of transmission are indicated. The countries of origin of the sequences are as follows: TOR2, Canada; Sin2679, Sin2774, Sin2748, Sin2500, and Sin2677, Singapore; CUHK-Su10, HKU-39849, and CUHK-W1, Hong Kong; Urbani, Vietnam; BJ01, BJ02, BJ03, and BJ04, Beijing, China; HSR1, Italy; Frankfurt1, Germany; the others, Taiwan. Clusters 1 and 2 contain strains related to Hotel M origins.