Fig. 1.

Correspondence between molecular phylogeny of M. tuberculosis strains isolated in San Francisco and birth regions of the corresponding patients. Four large geographic regions are indicated by color: blue, East Asia; pink, The Philippines; black, the Americas; orange, Africa, Europe, and the Middle East. Here and in figure 3 b and c of ref. 4, country of origin is indicated by the abbreviations at the top of the tree: CB, Cambodia; CH, China; CO, Colombia; ET, Ethiopia; HK, Hong Kong; IR, Iran; MC, Macau; MX, Mexico; RP, Philippines; RQ, Puerto Rico; U.S., United States; VM, Vietnam; YO, Yugoslavia. [Reproduced with permission from ref. 4 (Copyright 2004, National Academy of Sciences)].