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Clinical, pathogenetic, and laboratory features of Capnocytophaga infections
Insights
Capnocytophaga septicemia disproportionately affects children, with granulocytopenia and oral defects as key risk factors. Early laboratory diagnosis is crucial for identifying this infection, which can be mistaken for Fusobacterium nucleatum.
Area of Science:
- Infectious Diseases
- Microbiology
- Pediatrics
Background:
- Granulocytopenia and oral mucosal defects are recognized risk factors for Capnocytophaga septicemia.
- Capnocytophaga infections are increasingly identified, particularly in younger patients.
Purpose of the Study:
- To highlight the prevalence of Capnocytophaga septicemia in the pediatric population.
- To emphasize key laboratory diagnostic features for Capnocytophaga infections.
- To differentiate Capnocytophaga from similar-looking bacteria like Fusobacterium nucleatum.
Main Methods:
- Retrospective review of 13 Capnocytophaga infection cases over seven years.
- Analysis of patient demographics, clinical features, and laboratory data.
- Comparison with previously reported cases of Capnocytophaga septicemia.
Main Results:
- Seven patients presented with Capnocytophaga bacteremia.
- Six of the bacteremic patients had granulocytopenia and oral mucosal defects.
- Five of the seven bacteremic patients were under 20 years of age, indicating a pediatric preponderance.
Conclusions:
- Capnocytophaga septicemia shows a notable prevalence in pediatric patients.
- Prompt laboratory identification is essential, considering potential confusion with Fusobacterium nucleatum.
- Risk factors such as granulocytopenia and oral mucosal defects warrant clinical attention in pediatric cases.
Abstract:
Granulocytopenia and oral mucosal defects have been reported to be important predisposing factors to recently recognized cases of Capnocytophaga septicemia. The authors call attention to an apparent preponderance of these cases in the pediatric age group and emphasize laboratory features which they have found helpful in the diagnosis of Capnocytophaga infections. Thirteen patients with Capnocytophaga infections were seen during a seven-year period. Seven of these patients had Capnocytophaga bacteremia. Six of seven bacteremic patients were granulocytopenic, six had oral mucosal defects, and three died. Five of the seven bacteremic patients were younger than 20 years of age. This represents a disproportionate distribution of cases in the pediatric age group within the author's institution, because 43% of blood culture specimens submitted to their microbiology laboratory are obtained from pediatric patients. This observation is supported by a review of the reported cases of Capnocytophaga septicemia in which 7 of 12 patients were younger than 20 years of age. Because Capnocytophaga may superficially resemble the more commonly isolated Fusobacterium nucleatum, distinguishing features for laboratory identification are discussed.