CRP and Pleural effusion: On the 31st day of the illness, the child's temperature normalized, there was no cough, and repeat blood tests showed: WBC 6.4 × 109/L with 52.9% neutrophils, CRP 3.0 mg/L; thoracic ultrasound indicated right pleural effusion (7.7 mm) and partial consolidation in the right lung; abdominal ultrasound showed no significant abnormalities.