This work presents the results of determining the effect of eukaryotic microorganism-based activator on the synthesis of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6, IL-8) and the expression of cell adhesion markers (CD162, CD177) and cell activation markers (CD69, CD281, CD282, CD286) on the surface of neutrophils. The book will be useful for both researchers and practitioners of immunology and microbiology.