TREM1 and infection: However, analysis of the expression of TREM-1 within patients with sepsis found that it was significantly greater in patients with polymicrobial infections than in patients with monomicrobial infections (P = 0.040 regarding differences of % expression of TREM-1 on neutrophils; P = 0.008 regarding differences of MFI expression of TREM-1 on neutrophils).