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White blood cells are the primary defense within the body's immune system. Their job is to locate and engulf alien cells in the body. By doing so, they kill the disease/infection/virus. They are also what makes pus a yellowish color; it's the white blood cells that make it yellow, not the bacteria itself.

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9y ago
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11y ago

white blood cells are to kill viruses and bacteria. and also helps imune system.

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Wiki User

14y ago

To fight off infection

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Q: What is thhe purpose of white blood cells?
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