Which are the initial cells that alert the body to an infection, releasing chemicals to attract other white blood cells to the site of the infection?

Macrophages can recognize invading microbes in tissues and release signaling chemicals, such as cytokines and chemokines, that attract other white blood cells to the infection. Neutrophils are often among the first cells attracted, while “phagocytes” is a broad category that includes several kinds of cells.

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