Cytokine profiles in Mycoplasma pneumoniae infection-associated hemophagocytic lymphohistiocytosis.

A 3-year-old boy with Mycoplasma pneumoniae infection associated with hemophagocytic lymphohistiocytosis (MP-HLH) presented with an elevated level of serum interleukin-12 (IL-12) and lower levels of interferon-γ and IL-10 compared to patients with Epstein-Barr virus infection associated with HLH (EBV-HLH). Unlike the patients with EBV-HLH, CD8+ CD5low HLA-DR++ T cells were not detected in our pediatric patient. Thus, the pathophysiology of MP-HLH may differ from that of EBV-HLH.