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Eighty-seven oropharyngeal isolates of Haemophilus influenzae were obtained by two time cultures six months apart from a total of 288 children who attend a kindergarten. We analyzed the strains by comparing their serotypes, biotypes, beta-lactamase activity and by performing electrophoresis of outer membrane proteins on polyacrylamide gels. Only nineteen strains were not identical, the rest of the 68 strains were classified into 23 types. During 6 months at least 15 types of strains lost from this group and 21 types of new strains were obtained. There were no children who had identical pairs of H. influenzae in their oropharynx during the 6 months. The classification of strains in oropharynx suggested that person-to-person transmission of nontypable H. influenzae can occur. We concluded that oropharyngeal colonization by nontypable H. influenzae is not a normal flora in children.

Dynamic Process of Colonization by Haemophilus influenzae in Children