A single parasitic organism or animal that lives and reproduces in the blood.
From Greek haima (blood) + zoon (animal), singular form. This was one of the first scientific terms created specifically for blood parasites when microscopy revealed their existence.
Some hematozoa are so tiny that a single drop of blood can contain millions of them—yet a single organism is enough to cause serious illness! It's amazing that something invisible to the naked eye can transform a person's entire life.
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