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A systemic disease is one that affects a number of organs and tissues, or affects the body as a whole. [1] It differs from a localized disease , which is a disease affecting only part of the body (e.g., a mouth ulcer ).
A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells. [ 1 ] Examples include the common cold , gastroenteritis , COVID-19 , the flu , and rabies .
Comparison of viral and bacterial infection Characteristic Viral infection Bacterial infection; Typical symptoms In general, viral infections are systemic. This means they involve many different parts of the body or more than one body system at the same time; i.e. a runny nose, sinus congestion, cough, body aches etc.
Vaccine-associated enhanced disease VCFS Velo cardio facial syndrome: vCJD variant Creutzfeldt–Jakob disease: VD Venereal disease: VHF Viral hemorrhagic fever: VHL Von Hippel–Lindau disease: VKC Vernal keratoconjunctivitis: VKH Vogt–Koyanagi–Harada disease: VOD veno-occlusive disease VP Variegate porphyria: VSD Ventricular septal defect ...
A viral infection does not always cause disease. A viral infection simply involves viral replication in the host, but disease is the damage caused by viral multiplication. [5] An individual who has a viral infection but does not display disease symptoms is known as a carrier. [17] Mechanisms by which viruses cause damage and disease to host cells
Viral infections have long been suspected to cause ME/CFS, based on the observation that ME/CFS sometimes occurs in outbreaks and is possibly connected to autoimmune diseases. [38] How viral infections cause ME/CFS is unclear; it could be via viral persistence or via a "hit and run" mechanism, in which infections dysregulate the immune system ...
The viral genome is then known as a "provirus" or, in the case of bacteriophages a "prophage". [13]: 836 Whenever the host divides, the viral genome is also replicated. The viral genome is mostly silent within the host. At some point, the provirus or prophage may give rise to the active virus, which may lyse the host cells.
Active viremia is caused by the replication of viruses which results in viruses being introduced into the bloodstream.Examples include the measles, in which primary viremia occurs in the epithelial lining of the respiratory tract before replicating and budding out of the cell basal layer (viral shedding), resulting in viruses budding into capillaries and blood vessels.