- This article is about biological viruses. There are also computer viruses.
A virus is a submicroscopic parasite that can cause disease. They are a core of DNA or RNA surrounded by protein. Viruses are not considered lifeforms.
During a scan of Aldean DNA, Doctor Beverly Crusher was able to confirm that viral contaminants were not responsible for the Aldeans' sterility. (TNG: "When The Bough Breaks")
Dejaren, a Serosian HD25 Isomorphic Projection, claimed to B'Elanna Torres and the Doctor that a virus killed his crewmates, when in fact he murdered them. (VOY: "Revulsion")
Viral diseases
- Altarian encephalitis
- Anchilles fever
- Ankaran flu
- Arethian flu
- Choriocytosis
- Common cold
- Fostossa virus
- Genetic virus
- Intron virus
- Klingon augment virus
- Leutscher virus
- Levodian flu
- Life prolongation complex
- Macrovirus
- Memory virus
- Orkett's disease
- Phage
- Plasma plague
- Quazulu VIII virus
- Saurian virus
- Silicon-based virus
- Tarkalean flu
- Temecklian virus
- Terothka virus
- Terrellian plague
- Thelusian flu
- Urodelan flu
- Vegan D virus
Viral weapons
- Aphasia virus
- Biogenics
- Harvester
- Metagenics
- Microvirus
- Morphogenic virus
- Mutagenic virus
- Nanoprobe virus
- Neurolytic pathogen
- Omega IV virus
- Synthetic pathogen
- Teplan blight
- Ulcartic virus