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Clusters of Vietnamese M. tuberculosis strains (strains V1 to V14) hybridized with IS6110 (A), IS1081 (B), and PGRS (C). Clusters of isolates with the same IS6110 fingerprints were typed as VA (V1 to V10), VB (V11 and V12), or VC (V13 and V14). Four strains of type VA with a 1.3-kb PvuII fragment, two strains of type VB with a 1.5-kb fragment, and two strains of type VC were differentiated with the PGRS probe. Numbers on the left are in kilobases.
