Goal of the work was to evaluate the differences level among H. influenzae strains of b serotype isolated from children attending day-care centres and orphanages and among strains isolated from invasive infections. In the work PFGE in Hib strains transmission examination and for epidemiological studies among three sources of invasive infection was applied. Among 35 Hib strains tested and control strain 8 different pulsotyped were found. Among 21 strains colonising the nasopharynx of healthy children, and among 13 Hib strains isolated from cerebrospinal fluid, 6 and 1 pulsotypes were found, respectively. Results obtained show that healthy children might be colonizing with genotypes characteristic for Hib strains isolated from invasive infections. In this view wider Hib vaccination seems be expected, as Hib circulation is common.
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