1. Changes in the distribution of Haemophilus influenzae type b clones associated with widespread infant vaccination in Finland.
- Author
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van Alphen L, Takala AK, Geelen-van den Broek L, Dankert J, and Eskola J
- Subjects
- Adolescent, Age Factors, Bacterial Capsules, Bacterial Typing Techniques, Bacterial Vaccines, Child, Child, Preschool, Epiglottitis epidemiology, Epiglottitis microbiology, Epiglottitis prevention & control, Finland epidemiology, Haemophilus Infections epidemiology, Haemophilus Infections prevention & control, Haemophilus influenzae isolation & purification, Humans, Infant, Infant, Newborn, Meningitis, Haemophilus epidemiology, Meningitis, Haemophilus microbiology, Meningitis, Haemophilus prevention & control, Polysaccharides, Bacterial, Serotyping, Haemophilus Infections microbiology, Haemophilus Vaccines, Haemophilus influenzae classification, Vaccination
- Abstract
Isolates from 646 consecutive Finnish Haemophilus influenzae type b (Hib) patients with systemic disease, collected before and during large-scale vaccinations with Hib conjugate vaccines, were analyzed by major outer membrane protein (OMP) subtyping, lipopolysaccharide (LPS) serotyping, and biotyping (BT). Strains with OMP-BT-LPS combinations (clones) 1-I-1 and 1c-I-1 disappeared at the same rate as the disease they were associated with. A preferential decrease in the number of isolates of clone 1-II-1 was recorded, whereas the reduction in disease caused by strains of clone 1-II-9 occurred at a lower rate than expected. The latter clone occurred mainly in the most densely populated area of Finland. Strains belonging to all the common Hib clones were isolated from the 16 infants who acquired Hib disease despite being (partially) vaccinated. Thus, Hib clones disappeared during mass vaccination with conjugate vaccines, although at different rates.
- Published
- 1992
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