Volume 80, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


In Bamako, Mali, where surveillance revealed a high incidence of type b (Hib) invasive disease, Hib conjugate vaccine was introduced into the Expanded Program on Immunization and the impact assessed. Annual confirmed Hib hospitalizations for infants 0–11 months of age fell from 175/10 to 44/10 ( < 0.001); among infants 6–7 months of age Hib hospitalizations fell from 377/10 to 69/10, (82% decrease, < 0.001). Invasive hospitalizations remained unchanged. In a baseline serosurvey, only 3/200 infants 6–7 months of age (1.5%) had protective anti-polyribosylribitol phosphate (PRP) titers ≥ 0.15 μg/mL and 1(0.5%) had ≥ 1.0 μg/mL. In serosurveys 18 and 30 months after vaccine introduction, 168/201 (84%) and 184/200 (92%) infants, respectively, had titers ≥ 0.15 μg/mL and 141/201 (70%) and 163/200 (82%) had titers ≥ 1.0 μg/mL. Introduction of Hib vaccine led to rises in anti-PRP seroprevalence, significant reductions in Hib disease, and all-cause hospitalizations, whereas disease remained unchanged.


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  • Received : 18 Dec 2008
  • Accepted : 11 Feb 2009

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