Search results
Results from the WOW.Com Content Network
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
Many viruses can exist inside a host for long periods during which little damage is done. Extremely virulent strains can eventually evolve by mutation and natural selection within the virus population inside a host. The term "neurovirulent" is used for viruses such as rabies and herpes simplex which can invade the nervous system and cause ...
Viral transformation is the change in growth, phenotype, or indefinite reproduction of cells caused by the introduction of inheritable material. Through this process, a virus causes harmful transformations of an in vivo cell or cell culture.
Some viruses, such as Epstein–Barr virus, often cause cells to proliferate without causing malignancy; [46] but some other viruses, such as papillomavirus, are an established cause of cancer. [47] When a cell's DNA is damaged by a virus such that the cell cannot repair itself, this often triggers apoptosis.
The virus causes acute gastroenteritis — an inflammation of the stomach or intestines — which causes the diarrhea, vomiting, and stomach pains. Although most people recover in three days or ...
Viruses also have notable virulence factors. Experimental research, for example, often focuses on creating environments that isolate and identify the role of "niche-specific virulence genes". These are genes that perform specific tasks within specific tissues/places at specific times; the sum total of niche-specific genes is the virus' virulence.
Most viruses that enter can be opportunistic and accidental pathogens, but some like herpes viruses and rabies virus have evolved in time to enter the nervous system efficiently, by exploiting the neuronal cell biology. While acute viral diseases come on quickly, chronic viral conditions have long incubation periods inside the body.
There is a potential link between Alzheimer's disease and the herpes simplex virus-1 (HSV-1), which is a common cause for cold ... “Viral encephalitis causes confusion due to brain damage, not ...