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Invasive Haemophilus influenzae infections among children in Rochester, Minnesota: a population-based study
H A Guess1, S J Trippel, E H Corder
1Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill 27599-7400.
Abstract:
The incidence of invasive Haemophilus influenzae infections was studied among all residents of Rochester, Minnesota, under 20 years of age during the period 1975-1983. The incidence in children under 5 years of age was 115 and 64 cases per 100,000 children per year for all invasive cases and for meningitis, respectively. These rates are among the highest reported for an essentially all-Caucasian population in the United States, while the ratio of meningitis to non-meningitis cases (1.1:1) is among the lowest. This suggests possible under-ascertainment of non-meningitis cases in previous US studies of Haemophilus influenzae infections.
Insights
Invasive Haemophilus influenzae infections are high in young children in Rochester, MN. Lower-than-expected meningitis ratios suggest undercounting of non-meningitis cases in prior US studies.
Area of Science:
- Pediatrics
- Infectious Diseases
- Epidemiology
Background:
- Invasive Haemophilus influenzae (Hib) infections pose a significant public health concern, particularly in pediatric populations.
- Understanding the epidemiology of Hib infections is crucial for developing effective prevention and treatment strategies.
- Previous studies in the United States have reported varying incidence rates and disease manifestations.
Purpose of the Study:
- To determine the incidence of invasive Haemophilus influenzae infections in children under 20 years of age in Rochester, Minnesota, from 1975 to 1983.
- To analyze the specific incidence of Haemophilus influenzae meningitis within this population.
- To compare these findings with national data and investigate potential discrepancies in case ascertainment.
Main Methods:
- A population-based retrospective study was conducted.
- Data were collected on all residents under 20 years of age in Rochester, Minnesota, between 1975 and 1983.
- Incidence rates for all invasive Haemophilus influenzae cases and for meningitis were calculated per 100,000 children per year.
Main Results:
- The incidence of invasive Haemophilus influenzae infections in children under 5 was 115 cases per 100,000 children annually.
- The incidence of Haemophilus influenzae meningitis in children under 5 was 64 cases per 100,000 children annually.
- The ratio of meningitis to non-meningitis cases was 1.1:1, which is notably low compared to other US studies.
Conclusions:
- The incidence rates of invasive Haemophilus influenzae infections in young children in Rochester, Minnesota, during 1975-1983 were among the highest reported in the US for a predominantly Caucasian population.
- The low ratio of meningitis to non-meningitis cases suggests potential under-ascertainment of non-meningitis invasive Haemophilus influenzae infections in previous US-based studies.
- Further research is warranted to clarify the epidemiology and reporting of non-meningitis invasive Haemophilus influenzae infections across the United States.