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White blood cells
· White blood cells or leukocytes (also spelled
"leucocytes"), are cells of the immune
system involved in defending the body
against both infectious disease and foreign
materials. Five different types of leukocytes
exist, but they are all produced from a
multipotent cell in the bone marrow known
as a hematopoietic stem cell.…read more

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Whenever a germ or infection enters the
body, the white blood cells begins to work
and finds the problem. The white blood
cells are continually looking out for signs
of disease. When a germ does appear, the
white blood cells have a variety of ways by
which they can attack. Some will produce
protective antibodies that will overpower
the germ.…read more

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can be found into
five major
categories as
bacterium, virus,
protozoon, algae,
and fungus, but
not all of them
microorganism…read more

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A vaccine makes you
immune to a particular
disease. A vaccine typically
contains an agent that
resembles a disease-
causing microorganism,
and is often made from
weakened or killed forms of
the microbe or its toxins…read more


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