Acute viral nasopharyngitis pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1];Associate Editor(s)-in-Chief: Ahmed Younes M.B.B.CH [2] Syed Musadiq Ali M.B.B.S.[3]

Overview

Rhinovirus (the most common cause of common cold) is usually transmitted via aerosols generated by coughing or sneezing. The entry point is usually the nose, however viruses can enter the body through the lacrimal ducts. Following transmission, the virus invades epithelial cells and causes a release of inflammatory cytokines, leading to the various symptoms of the common cold. The body responds using cellular and humoral immunity in addition to the role of bacterial flora in the defense against the organism.

Pathophysiology

Virus

Common colds are most often caused by one of more than 100 serotypes of rhinoviruses, a type of picornavirus. Other viruses that can cause colds are coronavirus, human parainfluenza viruses, human respiratory syncytial virus, adenoviruses, enteroviruses, and metapneumovirus.[1][2][3]

Transmission

The common cold virus is transmitted between people by one of two ways:

  1. Aerosols generated by coughing and sneezing
  2. Saliva or nasal discharge, either directly or from contaminated surfaces
  • Asymptomatic patients can transmit the infection, too.[4]
  • The infectious period (i.e. the time during which an infected person can infect others) begins about one day before symptoms begin and continues for the first five days of the illness.
  • The virus enters the cells of the epithelium of the nasopharynx and rapidly multiplies.
  • The virus enters the body mainly through the nose. Other entry points include the eyes through drainage of tears from the lacrimal ducts into the nasopharynx.


Pathogenesis

References

  1. "Common Cold (Upper Respiratory Infection)". The Merck Manual Online. Merck & Co. November 2005.
  2. CKS (2007). "Common Cold (Topic Review)". Clinical Knowledge Summaries Service.
  3. 3.0 3.1 van Kempen M, Bachert C, Van Cauwenberge P (1999). "An update on the pathophysiology of rhinovirus upper respiratory tract infections". Rhinology. 37 (3): 97–103. PMID 10567986.
  4. "Common Cold" (PDF) (pdf). Department of Health, Government of South Australia. 2005.
  5. Blaas D, Fuchs R (2016). "Mechanism of human rhinovirus infections". Mol Cell Pediatr. 3 (1): 21. doi:10.1186/s40348-016-0049-3. PMC 4889530. PMID 27251607.

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