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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The smallest pathogen known is a type of virus called porcine circovirus, which is about 17 nanometers in diameter.
Any sort of virus is tiny compared to other living things. Check out the picornavirus
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.
The Epstein-Barr virus (EBV) is the pathogen that causes mononucleosis, also known as "mono" or the "kissing disease."
A carrier is an individual who harbors an infectious agent but does not show symptoms of the disease themselves. They can unknowingly transmit the agent to others, contributing to the spread of the disease in a population.
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An avirulent pathogen is a pathogen that is unable to cause disease in its host. This may be due to mutations that have reduced its ability to infect or harm the host, making it less pathogenic compared to a virulent pathogen.
There are infinitely many things that do not contribute to the virulence of a pathogen. Elvis does not contribute to the virulence of a pathogen.