Abstract
To investigate the lead exposure levels, and the effect of blood lead level (BLL) on recurrent respiratory infections in children aged 3-7 years in Shenyang. A case-control study including 78 children with recurrent respiratory infections and 141 controls was performed. Venous blood was obtained for BLL, and a questionnaire was completed. The BLL was significantly higher in children with recurrent respiratory infections than that in the control group [Median (IQR): 2.56 (1.29-6.19) vs 1.99 (0.90-5.92) µg/dL, P=0.029]. Children with BLL ≥1.95 µg/dL were more likely to be suffering from recurrent respiratory infections (OR=2.328, 95%CI=1.228-4.413) than those with BLL <1.95 µg/dL. High lead level can increase the risk of respiratory infections in preschool children.
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