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a Serviço de Pediatria, Hospital Universitário de Brasília, Universidade de Brasília, Brasília, Brazil
b Département des Maladies Infectieuses, Hôpital Universitaire des Enfants Reine Fabiola
c Laboratoire de Génétique des Procaryotes, Institut de Biologie et de Médecine Moléculaire
e Unité d'épidémiologie et d'hygiène hospitalière, Hôpital Brugmann, Université Libre de Bruxelles, Brussels, Belgium
d Serviço de Microbiologia, Hospital Regional da Asa Sul, Brasília, Brazil
OBJECTIVE. Existing scoring systems for the diagnosis of group A streptococcus pharyngitis are insensitive or inapplicable in low-resources settings. Bacterial cultures and rapid tests can allow for antibiotic prescription abstention in high-income regions. These techniques are not feasible in many low-resources settings, and antibiotics often are prescribed for any pharyngitis episode. However, judicious antibiotics prescription in the community also is of concern in low-income countries. The objective of this study was to develop a clinical decision rule that allows for the reduction of empirical antibiotic therapy for children with pharyngitis in low-resources settings by identifying nongroup A streptococcus pharyngitis.
PATIENTS AND METHODS. We prospectively included children with pharyngitis in 3 public hospitals of Brazil during 9 months in 2004. We filled out clinical questionnaires and performed throat swabs. Bilateral
2 (2-tailed test) and multivariate analysis were used to determine score categories. The outcome measures were sensitivity, specificity, positive likelihood ratio, and posttest probability of nongroup A streptococcus infection with the clinical approach as compared with throat culture.
RESULTS. A total of 163 of the 220 children had nongroup A streptococcus pharyngitis (negative culture). We established a 3-questions decision rule (age and viral and bacterial signs) with 3 possible answers. The use of this score would prevent 41% to 55% of unnecessary antimicrobial prescriptions. The specificity of the score for nongroup A streptococcus pharyngitis was >84%.
CONCLUSION. Such a clinical decision rule could be helpful to reduce significantly unnecessary antibiotic prescriptions for pharyngitis in children in low-resources settings.
Key Words: pharyngitis practice guidelines antibiotic use developing countries
Abbreviations: GASgroup A streptococcus
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