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[Evaluation of a rapid technique for detecting the type A Streptococcus antigen (Test Pack Strep A)].

OBJECTIVE
To test a rapid technique of Antigen Detection (TAD) of Type A Betahemolitic Streptococci (BHSA) in Acute Tonsillitis (AT), comparing it with and using as a point of reference traditional Blood Agar Cultivation (BAC). Additionally, the use of Clinical Data as a method of supposed Diagnosis was studied.


DESIGN
Prospective observational study. SITE. Health Primary Care (Maspalomas Health Centre).


PATIENTS AND OTHER PARTICIPANTS
118 patients between the ages of 1 and 71 affected by AT.


MEASUREMENTS AND MAIN RESULTS
There was a proportion of 13.56% BHSA in the AT of our sample, with a Confidence Interval (CI) of 95% (7.38-19.74) using the BAC; and 17.80% with a CI of 95% (10.90-24.70) using the TAD. The following values were obtained for the TAD: Sensitivity (S) of 93.75%, Specificity (Sp) of 94.12%, Positive Predictive Value (PPV) of 71.43% and Negative Predictive Value (NPV) of 98.9%. Of the clinical variables studied, only the presence/absence of Exudate and Adenopathies were linked to the presence of BHSA in the Cultivations (p less than 0.05 and p less than 0.01 respectively); with, however, inconclusive S, Sp, PPV and PNV values.


CONCLUSIONS
We found insufficient correlation between clinical findings and the presence of BHSA to consider it a valid method of supposed diagnosis. There was however a statistical link between the presence of Exudate and local Adenopathies, and a positive result in the cultivation. The TAD is shown to be a rapid method, easy to use, and highly reliable for the discovery of the presence of BHSA in AT.