Term: ebola virus: a filovirus that causes Ebola hemorrhagic fever; carried by animals; can be used as a bioweapon
Broader: virus: (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein | Unrelated: ulcer: a circumscribed inflammatory and often suppurating lesion on the skin or an internal mucous surface resulting in necrosis of tissue