Transmission of Cold
The common cold virus is transmitted between people by one of two mechanisms:
* in aerosol form generated by coughing, sneezing.
* from contact with the saliva or nasal secretions of an infected person, either directly or from contaminated surfaces.
Symptoms are not necessary for viral shedding or transmission, as a percentage of asymptomatic subjects exhibit viruses in nasal swabs.
The virus enters the cells of the lining of the nasopharynx (the area between the nose and throat), and rapidly multiplies. The major entry point is normally the nose, but can also be the eyes (in this case drainage into the nasopharynx would occur through the nasolacrimal duct).
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