There were no significant differences in serum PCT levels or the WBC/PLT ratio between in AF culture-positive (2.92 ± 2.87 ng/mL, 0.25 ± 0.05) and culture-negative (2.88 ± 3.29 ng/mL, 0.23 ± 0.36) DCPs with SBP; p > 0.05. This evidence concerns the gene CALCA and atrial fibrillation.