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Table 7. Comparison between Congo red agar test and PCR test results for icaA and icaD gene.

Congo red agar, n (%) Total P-value Chi-square value df
Positive N=26 Negative N=24
icaA
 Positive 19 (73.1%) 10 (41.7%) 29 (58.0%) 0.025* 5.1 1
 Negative 7 (26.9%) 14 (58.3%) 21 (42.0%)
icaD
 Positive 13 (50.0%) 17 (70.8%) 20 (40.0%) 0.133 2.3 1
 Negative 13 (50.0%) 7 (29.2%) 30 (60.0%)