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Genetic relatedness among invasive nontypeable H. influenzae isolates. The dendrogram shows the relationships of the sequence types of the 28 invasive NTHi strains. Including the biotypes and PCR results for the adhesin genes, the strains were divided into six clusters. The PCR products of strains 12, 17, 22, and 23 were shorter than expected. BLAST results were used to confirm that those strains had only partial segments of hia/hsf.
