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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
Rosalind Franklin proposed the full structure of the tobacco mosaic virus in 1955. One main motivation for the study of viruses is because they cause many infectious diseases of plants and animals. [1] The study of the manner in which viruses cause disease is viral pathogenesis. The degree to which a virus causes disease is its virulence. [2]
Their growth and reproduction within their hosts can cause disease. "Germ" refers to not just a bacterium but to any type of microorganism, such as protists or fungi, or other pathogens that can cause disease, such as viruses, prions, or viroids. [1] Diseases caused by pathogens are called infectious diseases. Even when a pathogen is the ...
Viruses can, and do, turn our world upside down. But they also made us into what we are today.
When the virus replicates faster than the immune system can control, it can destroy cells and harm the body, and it can even incite an over-zealous immune reaction that can cause other damage.
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.
RSV is respiratory syncytial (sin-SISH-uhl) virus, usually causes mild, cold-like symptoms, according to the federal Centers for Disease Control, and most people recover within a week or two.
Koch formulated his postulates too early in the history of virology to recognize that many viruses do not cause illness in all infected individuals, a requirement of the first postulate. HIV/AIDS denialism includes claims that the viral spread of HIV/AIDS violates Koch's second postulate, despite that criticism being applicable to all viruses.