Ancient Mycobacterium tuberculosis Beijing genotype clinical isolates are associated with drug resistance in Tianjin, China

XIE Tong，JU Han-fang，WANG Chun-hua， WANG Zhi-rui， MU Cheng，ZHAO Hui， WANG Yan-nan， WANG Xie-xiu.

Chinese Journal of Antituberculosis . 2015, (9): 928 -932 . DOI: doi:10.3969/j.issn.1000-6621.2015.05.003