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Similarity relationships between 92 H. influenzae isolates. The phenogram of fingerprints was generated from a simple-matching similarity matrix by means of the unweighted pair-group average clustering method. A similarity of 1.0 indicates 100% identity between strains. The cophenetic correlation coefficient (r) was 7.33. ●, Hib strains recovered from meningitis; ▴, Hib and noncapsulated isolates from diseases other than meningitis; ■, noncapsulated isolates from healthy carriers.
