Analysis of isolates recovered from multiple sites of the nasopharynx of children colonized by nontypeableHaemophilus influenzae

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To determine whether the nasopharynx of children is colonized by a single or multiple strains of nontypeableHaemophilus influenzae, cultures were obtained from six nasopharyngeal sites in five children. For each child, all isolates yielded identical polymerase chain reaction fingerprints. The results indicate that these children were colonized in the nasopharynx with a single strain of nontypeableHaemophilus influenzae at one time.