CRP and Pleural effusion: The occurrence of pleural effusion was associated with higher leukocytes count on admission (9322.8 ± 2846.6 vs. 7220.5 ± 2038.6, p = 0.007) but not with the fever grade (39.5 [38.9–39.8] vs. 38.9 [38.5–39.5], p = 0.152), CRP (3.1 [1.6–7.2] vs. 3.9 [1.2–8.6], p = 0.938), procalcitonin levels (0.1 [ 0.07–0.1] vs. 0.1 [0.07–0.85], p = 0.769), or age at inclusion (13.1 [8.3–15.4] vs.11.8 [7.9–14.8], p = 0.481).