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White blood cells (WBCs) defend the body against infection and coordinate immune responses. Neutrophils are the rapid responders, engulfing bacteria and releasing antimicrobial substances. Lymphocytes include B cells that produce antibodies, T cells that orchestrate cellular immunity, and natural killer cells that destroy infected cells. Monocytes mature into macrophages and dendritic cells, which digest microbes and present antigens to T cells. Eosinophils tackle parasites and modulate inflammation, while basophils release mediators of hypersensitivity reactions. WBCs work together in a dynamic balance to control infection and heal tissue. In clinical and supply contexts, ceftriaxone distributors keyword may appear in discussions of antimicrobial access.