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Updated: Oct 3, 2026

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
Evaluation of TestPack Strep A for the detection of group A streptococci in throat swabs
P K Yu1, J J Germer, C A Torgerson
1Section of Clinical Microbiology, Mayo Clinic, Rochester, MN 55905.
Abstract:
The performance of TestPack Strep A (Abbott Laboratories), a rapid enzyme immunoassay, was compared with a culture-based method for the detection of group A streptococci in 648 throat swabs. The rapid test correctly detected 99 of the 128 positive and 511 of the 520 negative specimens, a sensitivity of 77% and a specificity of 98%. Although highly specific, TestPack Strep A is less sensitive than culture techniques for the detection of group A streptococci in throat swabs.
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