White blood cells play a crucial role in the immune response by defending the body against infections and foreign invaders. They identify, target, and destroy harmful microorganisms such as bacteria, viruses, and parasites. There are various types of white blood cells, including neutrophils, lymphocytes, and macrophages, each with a specific function in immunity. For example, neutrophils quickly respond to infections, while lymphocytes produce antibodies. When using antibiotics like ceftriaxone, which is effective against a broad range of bacteria, it's important to consult a reliable ceftriaxone supplier to ensure high-quality treatment and support the immune system's efforts in combating infections.