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Tuberculosis incidence rates correlate with poor socio-economic conditions. (A) Estimated levels of global unrest, with level 1 indicating minimal or no unrest, level 2 some unrest and level 3 high-level unrest or potential for unrest. Adapted from a map by Albert Jongman, Leiden University. (B) Global tuberculosis incidence rates. Adapted from World Health Organization reports. (www.who.int/gtb).
