common cold

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cold, common,

acute viral infection of the mucous membranes of the nose and throat, often involving the sinuses. The typical sore throat, sneezing, and fatigue may be accompanied by body aches, headache, low fever, and chills. The congested and discharging mucous membrane may become a fertile ground for a secondary bacterial invasion that can spread to the larynx, bronchi, lungs, or ears. Uncomplicated infections usually last from three to ten days.

The cold is the most common human ailment. Most adult Americans suffer from one to four colds per year, but children ages one to five—who are the most susceptible—typically may contract as many as eight. Colds are spread by respiratory droplets or by contaminated hands or objects. Although the incidence of colds is higher in winter, exposure to chilling or dampness is considered to be of little significance.

Any one of up to 200 viruses (such as the rhinoviruses, coronavirusescoronavirus,
any of a group (family Coronaviridae, subfamily Coronavirinae) of enveloped single-stranded RNA viruses that have a crownlike or sunlike appearance under an electron microscope due to the presence of spikes on their surface.
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, or respiratory syncytial virus [RSV]) can cause colds, to which it seems almost no one is immune. Infection with a viral strain confers only temporary immunity to that strain. Colds in infants and young children caused by RSV can progress to pneumonia and other complications, especially in those under a year old who were born prematurely or have chronic lung disease; RSV causes an estimated 4,500 deaths yearly in these groups in the United States.

Treatment for the common cold aims at relieving symptoms and keeping the body well-rested, -fed, and -hydrated. Because of the growing problem of drug resistance, doctors are discouraged from prescribing antibiotics (which do not affect viruses) for colds unless secondary bacterial infection makes them necessary. There is some evidence that zinc preparations, when taken within 24 hours of the first cold symptoms, can shorten the duration and moderate the symptoms of an infection, but there is no convincing evidence that vitamin C megadoses can prevent the common cold.

Researchers have reported reduction or prevention of cold symptoms in human tests of an experimental drug against rhinoviruses, which cause nearly half of all colds. The drug acts by imitating a molecule in the body called ICAM-1, to which the rhinovirus attaches to produce colds. As rhinoviruses attach to the decoy molecules instead, the likelihood or severity of infection is decreased.

Common cold

An acute infectious disorder characterized by nasal obstruction and discharge that may be accompanied by sneezing, sore throat, headache, malaise, cough, and fever. The disorder involves all human populations, age groups, and geographic regions; it is more common in winter than in summer in temperate climates. Most people in the United States experience at least one disabling cold (causing loss of time from work or school or a physician visit) per year. Frequencies are highest in children and are reduced with increasing age.

Most, or possibly all, infectious colds are caused by viruses. More than 200 different viruses can induce the illness, but rhinoviruses, in the picornavirus family, are predominant. Rhinoviruses are small ribonucleic acid-containing viruses with properties similar to polioviruses. Other viruses commonly causing colds include corona, parainfluenza, influenza, respiratory syncytial, entero, and adeno. See Adenoviridae, Rhinovirus

Cold viruses are spread from one person to another in either of two ways: by inhalation of infectious aerosols produced by the sneezing or coughing of ill individuals, or by inoculation with virus-containing secretions through direct contact with a person or a contaminated surface. Controlled experiments have not shown that chilling produces or increases susceptibility to colds. Infection in the nasopharynx induces symptoms, with the severity of the illness relating directly to the extent of the infection. Recovery after a few days of symptoms is likely, but some individuals may develop a complicating secondary bacterial infection of the sinuses, ear, or lung (pneumonia).

Colds are treated with medications designed to suppress major symptoms until natural defense mechanisms terminate the infection. Immunity to reinfection follows recovery and is most effective in relation to antibody in respiratory secretions. There is no established method for prevention of colds; however, personal hygiene is recommended to reduce contamination of environmental air and surfaces with virus that may be in respiratory secretions. See Pneumonia

common cold

[¦käm·ən ′kōld]
(medicine)
A viral disease of humans most frequently caused by the rhinovirus and accompanied by inflammation of the mucous membranes of the nose, throat, and eyes.

common cold

a mild viral infection of the upper respiratory tract, characterized by sneezing, coughing, watery eyes, nasal congestion, etc.
References in periodicals archive ?
feature generates notifications when a user may be at risk for possible exposure to the common cold.
It is regrettable that the serendipitous discovery about zinc and the common cold occurred in 1979, yet most victims in 2014 still do not know how to use zinc to shorten cold duration.
If the common cold symptoms last for more than two weeks, it is allergic rhinitis, or inflammation of the nasal membranes.
However, the most common causes of the common cold are viruses -- rhinoviruses, corona viruses, and the respiratory syncytial virus (RSV).
Currently available zinc preparations marketed for treatment of the common cold are in lozenge, rather than tablet, form.
The utility of vitamin C as a prophylactic agent for the common cold still remains to be established.
The common cold is spread either by direct contact with infected secretions from contaminated surfaces or by inhaling the airborne virus after individuals sneeze or cough.
Striking a possible blow against some home remedies, recent studies suggested echinacea is not beneficial in treating the common cold and cranberry juice does not help stave off urinary tract infections.
Echinacea for the common cold has been assessed in hundreds of studies, including more than a dozen randomised trials and several meta-analyses.
Previously, some researchers have suggested that sleep quality may predict susceptibility to the common cold.
More recently echinacea has been hailed as both a treatment for and a way of preventing the common cold.
Scientists pieced together elements of the genetic code for all known strains of the human rhinovirus which causes the common cold.