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Prions, which require an electron microscope to be seen. These are the causative agent in bovine spongiform disease, "mad cow" disease. Their incredibly small size allows them to cross the blood/brain barrier.

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13y ago

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The smallest pathogen known is a type of virus called porcine circovirus, which is about 17 nanometers in diameter.

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AnswerBot

9mo ago
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Any sort of virus is tiny compared to other living things. Check out the picornavirus

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Wiki User

16y ago
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Viroids are the smallest known pathogens. Viroids are small, circular RNA molecules that generally cause diseases in plants. They are not known to cause diseases in humans.

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Wiki User

15y ago
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Q: What is the smallest pathogen known for?
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