White blood cells (leukocytes) are central to the immune response and protect the body against infections through coordinated innate and adaptive mechanisms. Neutrophils rapidly phagocytose and destroy invading bacteria using reactive oxygen species and antimicrobial enzymes. Macrophages ingest pathogens and present antigens to lymphocytes, linking innate and adaptive immunity. B lymphocytes produce pathogen-specific antibodies, while T lymphocytes directly kill infected cells or regulate immune signaling. In clinical settings where bacterial load overwhelms host defenses, antibiotics supplied by a reliable ceftriaxone injection supplier support immune function by inhibiting bacterial cell wall synthesis, allowing white blood cells to clear the infection effectively.
