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Pediatric Infectious Disease Journal:
doi: 10.1097/INF.0b013e31806166a0
Original Studies

Effectiveness of Haemophilus influenzae Type B Conjugate Vaccine on Prevention of Pneumonia and Meningitis in Bangladeshi Children: A Case–Control Study

Baqui, Abdullah H. MBBS, MPH, DrPH*; El Arifeen, Shams MBBS, MPH, DrPH†; Saha, Samir K. PhD‡; Persson, LarsÅke MD§; Zaman, K MBBS, PhD†; Gessner, Bradford D. MD∥; Moulton, Lawrence H. PhD*; Black, Robert E. MD, MPH*; Santosham, Mathuram MD, MPH*

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Abstract

Background: Few Asian countries have introduced Haemophilus influenzae type b (Hib) conjugate vaccine because of its cost and uncertainty regarding disease burden.

Methods: To estimate the effectiveness of Hib conjugate vaccine in preventing pneumonia and meningitis in children age <2 years, an incident case–control study was conducted in a birth cohort of about 68,000 infants in Dhaka city, Bangladesh. DPT vaccine was systematically replaced by a combined Hib-DPT vaccine in selected immunization centers of the study area. Four matched community- and 2 hospital-controls were randomly selected for each confirmed case of pneumonia and meningitis from the study area.

Results: About 35% of the infants received each of the 3 doses of Hib-DPT vaccine. There were 2679 children who had a chest roentgenogram. For 475 children, a radiologist and a pediatrician independently identified substantial alveolar consolidation. Following at least 2 doses of Hib vaccine, the preventable fractions [95% confidence intervals (CI)] using community and hospital controls were 17% (−10% to 38%) and 35% (13% to 52%) respectively. Of these 475 cases, 2 radiologists with the World Health Organization concurred with the findings for 343 patients, yielding preventable fractions of 34% (6% to 53%) and 44% (20% to 61%). Fifteen confirmed Hib meningitis cases were identified; the preventable fractions (95% CI) using community and hospital controls, respectively, were 89% (28% to 100%) and 93% (53% to 100%).

Conclusions: The study documented that significant fractions of pneumonia and meningitis in Bangladeshi children age <2 years can be prevented by the Hib conjugate vaccine.

© 2007 Lippincott Williams & Wilkins, Inc.

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