Role of rapid antigen detection test for the diagnosis of group-A beta-hemolytic streptococcus in patients with pharyngotonsillitis

Revista Brasileira de Otorrinolaringologia

Araujo Filho, Bernardo Cunha¹  Sennes, Luiz Ubirajara¹  HCFMUSP¹  Sakae, Flávio Akira¹  SBORL¹  Universidade de São Paulo¹  Imamura, Rui¹ 

关键词: rapid antigen detection test;    group A b-hemolytic streptococcus;    pharyngotonsillitis.;   

DOI  :  10.1590/S0034-72992006000100003

学科分类：医学（综合）

来源: Associacao Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial

【 摘 要 】

Group A b-hemolytic streptococcus (GAS) is an important pharyngotonsillitis etiologic agent. Correct etiologic diagnosis and early treatment prevent suppurative and non-suppurative complications of streptococcal pharyngotonsillitis, however, clinical diagnostic methods are not reliable. Within this context, rapid detection methods of GAS antigen are useful to diagnose this agent.AIM: The objective of the present study was to determine the sensitivity and specificity of rapid GAS antigen detection tests used in Brazil.STUDY DESIGN: Clinical prospective.METHODS: Eighty-one patients with clinical diagnosis of acute pharyngotonsillitis seen at the otorhinolaryngology emergency department of University Hospital, FMUSP, between May 2001 and April 2002, were submitted to two simultaneous collections of oropharyngeal material using swabs. Rapid GAS antigen detection test was compared to culture on blood agar, the gold standard for the diagnosis of this etiologic agent.RESULTS: Among the 81 studied patients, the rapid test was positive in 56% and negative in 44%. GAS growth in culture was observed for 40.7% of the patients. The sensitivity and specificity of the rapid test were, respectively, 93.9% and 68.7%, and the negative and positive predictive values were 94.2 and 67.4%, respectively.CONCLUSIONS: We concluded that the high sensitivity of the test permits its use for the identification of patients with GAS. Rapid streptococcal antigen detection tests have been shown to be an important supporting tool in the etiologic diagnosis of pharyngotonsillitis.

【 授权许可】

Unknown