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The admission serum and BALFs levels of YKL-40 in healthy control and child pneumonia. a. The serum levels of YKL-40 in healthy volunteers and different kinds of infectious pneumonia of children. VP, viral pneumonia. BP, bacterial pneumonia. CO-I, co-infection. b. The difference between the serum and BALFs levels as well as the BALFs levels among the VP, BP and co-infection. All data presented by mean ± SD. *** P < 0.001 **P < 0.01 *P < 0.05
