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Neighbor-joining dendrogram based on concatenated sequences of the housekeeping genes adk, atpG, frdB, mdh, pgi, and recA. Seven hundred sixty H. influenzae sequences were retrieved from the MLST database and are identified by the letters “ST” followed by a number. Samples that had their OMP P6 gene sequenced are identified with the letters “HH” followed by a number. ST379, identified by a double arrow, is the concatenated sequence of ATCC 33390, an H. haemolyticus strain.
