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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
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.
These latent viruses might sometimes be beneficial, as the presence of the virus can increase immunity against bacterial pathogens, such as Yersinia pestis. [112] Some viruses can cause lifelong or chronic infections, where the viruses continue to replicate in the body despite the host's defence mechanisms. [113]
An infection from a virus or bacteria, like bronchitis, tonsillitis and sinusitis, can cause inflammation and a buildup of mucus in the back of the throat, also called post-nasal drip, says Hoss.
A human pathogen is a pathogen (microbe or microorganism such as a virus, bacterium, prion, or fungus) that causes disease in humans. The human physiological defense against common pathogens (such as Pneumocystis) is mainly the responsibility of the immune system with help by some of the body's normal microbiota.
Unfortunately, norovirus infections can and do happen. “Norovirus is a ubiquitous virus that everyone experiences multiple times in their life,” Adalja says. The best you can do is try to ...
Persistent infections are characterized by the continual presence of the infectious organism, often as latent infection with occasional recurrent relapses of active infection. There are some viruses that can maintain a persistent infection by infecting different cells of the body. Some viruses once acquired never leave the body.
But Sax said a patient at the end of a norovirus infection can eat whatever they want if they feel their body is ready. He recommends avoiding alcohol as it tends to slow down the recovery process.