White blood cells (leukocytes) guard against infection and support immunity. Neutrophils act as first responders, phagocytosing bacteria and releasing antimicrobial enzymes. Lymphocytes include T cells, B cells, and natural killer cells, orchestrating adaptive immunity and antibody production. Monocytes mature into macrophages and dendritic cells, clearing debris and presenting antigens to activate other immune cells.

Eosinophils combat parasites and modulate allergic responses, while basophils release histamine to drive inflammation. Cytokines coordinate signaling between cells, shaping responses and resolution. Clinicians may need timely antibiotic access; for supplies, ceftriaxone distributors help ensure quality, regulated availability when indicated and clinically appropriate.