Decode Your Blood Test: White Blood Cells 💉 | Merck Manual Consumer Version

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White blood cells are the fighters of the blood. They work to combat infections and cancers. Watch to learn more about them, as well as what happens when you have too many or too few white blood cells.

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First published in 1899 as a small reference book for physicians and pharmacists, The Merck Manual grew in size and scope to become one of the world's most widely used comprehensive medical resources for professionals and consumers. As The Manual evolved, it continually expanded the reach and depth of its offerings to reflect the mission of providing the best medical information to a wide cross-section of users, including medical professionals and students, veterinarians and veterinary students, and consumers.