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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
Hepatitis viruses can develop into a chronic viral infection that leads to liver cancer. [143] [144] Infection by human T-lymphotropic virus can lead to tropical spastic paraparesis and adult T-cell leukaemia. [145] Human papillomaviruses are an established cause of cancers of cervix, skin, anus, and penis. [146]
Viral pneumonia is a pneumonia caused by a virus. Pneumonia is an infection that causes inflammation in one or both of the lungs. The pulmonary alveoli fill with fluid or pus making it difficult to breathe. [1] Pneumonia can be caused by bacteria, viruses, fungi or parasites. [1]
Respiratory syncytial virus (RSV) causes infections of the breathing passages and lungs. It's so common that most children have been infected with the virus by age 2, according to the Mayo Clinic.
A chronic gut infection caused by a common virus may be linked to the progression of Alzheimer’s disease, a new study has found. Cytomegalovirus, or HCMV, is one of nine herpes viruses that most ...
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 are the common cold , gastroenteritis and pneumonia .
Some flu viruses carried by birds cause only mild infections and are classified as low-pathogenic viruses. In contrast, H5N1 often kills birds that catch it, so it is classified as a highly ...
Viruses cause different diseases depending on the types of cell that they infect. Some viruses can cause lifelong or chronic infections where the viruses continue to reproduce in the body despite the host's defence mechanisms. [52] This is common in hepatitis B virus and hepatitis C virus infections.