AML patients with CDI had a median of 7 (0–28) days with fever compared with 5 (0–31) days with fever in AML patients without CDI (p = 0.048); median CRP levels were 4.58 (0.39–19.42) in AML patients with CDI and 3.99 (0.19–34.66) in AML patients without CDI (p = 0.312). This evidence concerns the gene CRP and clostridium difficile infection.