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Epidemiology of Haemophilus influenzae Serotype a, North American Arctic, 2000–2005
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Jan 2008
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Source: Emerg Infect Dis 14(1):48-55
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Alternative Title:Emerg Infect Dis
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Description:Before the introduction of Haemophilus influenzae type b (Hib) conjugate vaccines, rates of invasive H influenzae disease among indigenous people of the North American Arctic were among the highest in the world Routine vaccination reduced rates to low levels; however, serotype replacement with non-type b strains may result in a reemergence of invasive disease in children We reviewed population-based data on invasive H influenzae in Alaska and northern Canada from 2000-2005; 138 cases were reported Among 88 typeable isolates, 42 (48%) were H influenzae type a (Hia); 35 (83%) occurred in indigenous peoples Among Hia patients, median age was 11 years; 62% were male; 1 adult died Common clinical manifestations included meningitis, pneumonia, and septic arthritis Overall annual incidence was 09 cases per 100,000 population Incidence among indigenous children <2 years of age in Alaska and northern Canada was 21 and 102, respectively Serotype a is now the most common H influenzae serotype in the North American Arctic; the highest rates are among indigenous children
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