Infectious Agent

• virus

  (virology) ultramicroscopic infectious agent that replicates itself only within cells of living...

• pathogen

  Any disease-producing agent (especially a virus or bacterium or other microorganism).

Also contains

• bacteria

  (microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms...

• vector

  Any agent (person or animal or microorganism) that carries and transmits a disease; "mosquitos...

• moneran

  Organisms that typically reproduce by asexual budding or fission and whose nutritional mode...

• protoctist

  Any of the unicellular protists.

• virulence

  Extreme harmfulness (as the capacity of a microorganism to cause disease); "the virulence...

• microflora

  Microscopic plants; bacteria are often considered to be microflora.

• monad

  (biology) a single-celled microorganism (especially a flagellate protozoan).

• pilus

  Hairlike structure especially on the surface of a cell or microorganism.

• intestinal flora

  Harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract...

• microbe

  A minute life form (especially a disease-causing bacterium); the term is not in technical...

• bacteremia

  Transient presence of bacteria (or other microorganisms) in the blood.

• protist

  Free-living or colonial organisms with diverse nutritional and reproductive modes.