CXCL16 and Mycoplasma pneumoniae pneumonia: Moreover, the results showed that the serum levels of sTREM-1 and CXCL-16 in children with Mycoplasma pneumonia were positively correlated with their illness (CPIS score), which further indicated that the serum levels of sTREM-1 and CXCL-16 were closely correlated with the illness of children with Mycoplasma pneumonia.