Figure 1.

A, Sample enrollment and study flowchart. B, Provinces of origin of patients with multidrug-resistant tuberculosis before migrating to Shenzhen. The numbers of enrolled patients who were born in the different provinces of China are indicated within circles. Green circles indicate provinces where less than 10 patients were born, blue circles indicated provinces where 10–50 patients were born, and the red circle indicates cases from Guangdong province with the exception of Shenzhen. Abbreviations: MDR-TB, multidrug-resistant tuberculosis; TB, tuberculosis.