What is the role of leukocytes in bacterial infections?

Study for the Cengage Microbiology Test with helpful multiple choice questions and detailed explanations. Ace your exam with confidence!

Leukocytes fight bacterial infections mainly by acting as frontline killers and alarm signals. Neutrophils rush to the infection site and rapidly engulf bacteria in a process called phagocytosis, digesting them with lysosomal enzymes and reactive oxygen species. Macrophages arrive later to continue phagocytosis, clear dead cells and bacteria, and release cytokines that orchestrate inflammation and recruit more immune cells. This inflammation increases blood flow and permeability, helping contain the infection and amplify the immune response. So, the combination of phagocytosis and inflammatory signaling by these cells directly reduces bacterial load and coordinates broader defense. Antibody production is handled by a subset of leukocytes (B cells) as part of the adaptive response, while collagen production and oxygen transport involve other cell types, not leukocytes in this context.