A parasite that lives inside the body of its host organism.
From Greek 'endo-' (within) + 'parasite' (from Greek 'parasitos,' meaning one who eats at another's table). The term literally describes organisms that parasitize from the inside rather than external surfaces.
Tapeworms and malaria parasites are master architects of invisibility—they evolved to hide inside their hosts' bodies where the immune system has a harder time finding them. This is why internal parasites are often more dangerous than external ones.
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