Virus
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. ()

Sickbay facilities on  starships were capable of designing viruses. Dr. Crusher needed to design one for John Doe to boost his ATP production. ()

Deep Space 9 was infected by a Cardassian virus, which was accidentally activated by Miles O'Brien when he repaired the food synthesizers. ()

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. ()

Viral diseases
Altarian encephalitis
Anchilles fever
Ankaran flu
Arethian flu
Chamberlin virus
Choriocytosis
Common cold
Fostossa virus
Genetic virus
Intron virus
Klingon augment virus
Leutscher virus
Levodian flu
life prolongation project
Macrovirus
Memory virus
Nehret
Orkett's disease
Parinisti measles
Phage
Plasma plague
Quazulu VIII virus
Saurian virus
Silicon-based virus
Tarkalean flu
Temecklian virus
Terothka virus
Terrellian plague
Thelusian flu
Urodelan flu
 Zanthi fever

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

Tools of treatment
Antigen
Synthetic antigen
Antiviral protein
 Antivirus
"Linear Models of Viral Propagation"
Medicine
Nanoprobes
Vaccines

See also
Pathogen
Polywater
Prion
Retrovirus
Rhinovirus
Quarantine

External link
 

de:Virus
Microorganisms
Medical conditions