Viral contagion

Viral contagion
Viral infections lead to diseases whose infections are caused by the viruses, the small particles made up of a genetic material (DNA or RNA) which is surrounded by a protein coat. The virus was originally meant as venom in 1599. Viruses rely on the organisms that they infect (host) for their survival. There are different kinds of viruses which cause infections. The viral infection can occur in any of the body parts. Some viruses are mainly seen in intestines; some viruses prefer lung and airways. The common symptoms of viral infections are fever, headache and fatigue.

Depending on the virus, the symptoms of infections are coughs, diarrhoea, abdominal pain, sore throat, etc. As the infection progresses, it may become painful and the symptoms become more provoked. The pathogenesis is the process where the infection leads to disease. The pathogenic mechanism of a viral disease includes:
  1. Nidation of the virus at the portal of entry: The virions engraft into the living cells mainly through the respiratory, genital routes, skin-piercing, gastrointestinal and other routes.
  2. Local replication: The virus spreads among the cells both extracellularly and intracellularly. The formation of local infection may lead to localised shedding of virus.
  3. Propagate to target organs (disease sites): Depending on the relationship between the virus and host defences, virus multiplication in the target site may cause disease and death.
  4. Disseminate to sites of shedding of virus into the environment: While the respiratory tract, genital tract and blood are the most frequent sites of shedding, various viruses may shed nearly every site.

Viruses are like hijackers. They infringe living, normal cells and the cells get replicated. This finally kills the cells and makes one sick. Viral infections are very difficult to treat because they live inside the body cells. Antibiotics usually will not work out for viral infections. They can be protected from medication which unremarkably passes through the bloodstream. Few antiviral medicines are available to slow down the viral infection activity. Vaccines can also prevent the viral infections and many viral diseases.


How to cite this article:
G Vaishmaashree. Viral contagion. BioLim O-Media. 08 August, 2016. 4(8).
Available from: http://www.biolim.com/read/BOMA0129.