More recently, it has been found that the neutrophil cluster of differentiation 64 (nCD64) which is also known as the high-affinity immunoglobulin Fc-receptor I (FcγR1) (12) is a sensitive and specific marker for diagnosing sepsis caused by bacterial infections and for distinguishing sepsis from non-septic conditions (13–15). This evidence concerns the gene FCGR1A and bacterial infectious disease.