TABLE 1.

M. tuberculosis Beijing strain collection

Geographic origin	No. of isolates	Reproducibility panel (n)	Global panel (n)	Outbreak panel (n)	Sampling
Northwest Russiaa	76	76	76		Conveniencee
Central Russiab	94	94	87		Convenience
Germany	94	94	94		MDR TB cases
Japan	94	94	94		Randomf
Singapore	94	94	93		Convenience
South Africac	94	94	90		Genotype selectiong
Gran Canaria	92		1d	92d	Outbreak relatedh
Total	638	546	535	92

^aSaint Petersburg and Kaliningrad regions.

^bSamara Oblast.

^cCape Town region.

^dOne representative sample of the outbreak panel was included in the global panel.

^eFrom Beijing isolates identified in strain collections described in references 39 (n = 41) and 40 (n = 35).

^fRandom selection from 228 Beijing isolates, identified among 325 isolates selected from 3,122 isolates collected for a drug resistance survey from the whole of Japan in 2002.

^gSelection based on IS6110 RFLP profiles identified in reference 15.

^hIncluding isolates collected at early, intermediate, and recent time points of the outbreak described in references 22 and 29 (see also text).