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Chang TC, Huang SH, Chao HY, Chen BL, Chen C, Chen CH, Chen TR, Chin CY, Chiu CP, Chiu FP, Chou J, Chyr CY, Chu SY, Hsiao SM, Hsieh YM, Huang A, Huang WI, Hung SS, Ko HC, Lin LP, Lin PY, Liu CB, Liu FC, Sheu YI, Shie JS, Tai TF, Tsai SJ, Wang SJ, Wen SC, Wong HC, Yan LP, Yeh T. Efficacy of a Latex Agglutination Test for Rapid Identification of Staphylococcus aureus: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/79.3.661] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Fifteen laboratories completed a collaborative study comparing the efficacy of a latex agglutination kit (Aureus Test) with that of AOAC Official Method 987.09 (coagulase test for identification of Staphylococcus aureus). Each laboratory analyzed 240 strains of bacteria, including 160 isolates of S. aureus and 80 isolates of other bacteria. Upon receipt of cultures, collaborators subcultured each isolate on both tryptic soy agar (TSA) and Baird-Parker agar medium (BPA) to determine whether the growth medium has any effect on either method. For cultures grown on TSA, the latex test had sensitivity and specificity rates of 99.2 and 97.1 %, respectively, whereas the coagulase test had respective rates of 98.4 and 92.5%. For cultures able to grow on BPA, the latex test had sensitivity and specificity rates of 99.2 and 96.6%, respectively, while the coagulase test had respective rates of 98.3 and 91.3%. By using the McNemar pairwise comparison test of the 2 methods, the falsepositive and false-negative rates of the latex test were significantly lower (p < 0.01) than those of the coagulase test for strains grown either on TSA or BPA. The latex agglutination test for identification of S. aureus isolated from foods has been adopted by AOAC INTERNATIONAL.
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Affiliation(s)
- Tsung C Chang
- Food Industry Research and Development Institute, PO Box 246, Hsinchu 300, Taiwan, Republic of China
| | - Su H Huang
- Food Industry Research and Development Institute, PO Box 246, Hsinchu 300, Taiwan, Republic of China
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