<em>Fimbriae are very tiny appendages of about 3 to 10 nm in diameter found on the surface of most Gram-negative and some Gram-positive bacterial cells. They are mostly utilized as a structure to adhere to one another, to other organisms, or any other surfaces.</em>
Fimbriae generally contain adhesins, a virulence factor that facilitates adhesion to surfaces and <u>due to their tiny size, they can only be viewed using the electron microscope</u> - the scanning electron microscope to be precise.
