The Collaborative International Dictionary
Microparasite
Microparasite \Mi`cro*par"a*site\, n. A parasitic micro["o]rganism. -- Mi`cro*par`a*sit"ic, a.
Wiktionary
microparasite
n. An extremely small parasite.
Wikipedia
Microparasite
A microparasite is a parasite of microscopic size. Opposed to macroparasites, which can be seen with the naked eye. Bacteria, viruses, protozoans are examples of microparasites.
Usage examples of "microparasite".
They caught microparasites, which were the inevitable inconvenience of strange worlds: native mites who had already learned to feast on the leaky joint sleeves and porous sheaths of the podia.
As if microparasites (nonliving, of course) had chewed through the satellite's circuitry in the front section.