Plasma CXCL13 levels were also significantly higher in the RSV bronchiolitis group [258.76 (199.19, 354.66) pg/mL vs. 127.68 (82.43, 214.50) pg/mL; P < 0.001], as were plasma CCL13 levels [239.33 (125.11, 335.76) vs. 97.69 (54.38, 219.80) pg/mL; P < 0.001]. Here, CXCL13 is linked to respiratory syncytial virus bronchiolitis.