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Clinical and epidemiologic studies of pneumococcal infection in children
Abstract:
Streptococcus pneumoniae was isolated from 1310 children in a 5-year period from 1979 through 1984. There were 44 cases of meningitis, 172 bacteremic infections, 787 cases of otitis media and 307 respiratory and miscellaneous isolates. The majority of infections could be accounted for by a small number of serotypes, with types 3, 6, 14, 19 and 23 predominating. Most infections (70%) occurred in infants younger than 2 years of age. However, nearly one-fourth of those suffering systemic illness had some underlying condition which may have contributed to their risk for infection, even beyond 2 years of age. Ten of the 12 deaths occurred in patients with altered host defenses. Characteristics of pneumococcal disease and the distribution of serotypes are discussed in relation to the work of other investigators over the past 50 years.
Insights
Streptococcus pneumoniae infections, including meningitis and otitis media, predominantly affected children under two years old. Specific serotypes were most common, and underlying conditions increased risk, especially in fatal cases.
Area of Science:
- Pediatrics
- Infectious Diseases
- Microbiology
Background:
- Streptococcus pneumoniae is a leading cause of childhood bacterial infections.
- Understanding serotype distribution and risk factors is crucial for prevention strategies.
Purpose of the Study:
- To analyze the epidemiology of Streptococcus pneumoniae infections in children.
- To identify predominant serotypes and associated risk factors for severe disease.
Main Methods:
- Retrospective analysis of Streptococcus pneumoniae isolates from 1310 children over a 5-year period (1979-1984).
- Categorization of infections into meningitis, bacteremia, otitis media, and respiratory/miscellaneous isolates.
- Serotyping of predominant strains and analysis of patient demographics and clinical outcomes.
Main Results:
- Streptococcus pneumoniae was isolated from 1310 children, with 70% of infections occurring in those under 2 years.
- Predominant serotypes included 3, 6, 14, 19, and 23.
- Underlying conditions were noted in nearly 25% of systemic illness cases, and 10 of 12 deaths occurred in immunocompromised patients.
Conclusions:
- A small number of Streptococcus pneumoniae serotypes are responsible for the majority of childhood infections.
- Young age and underlying host defense alterations are significant risk factors for severe pneumococcal disease.