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 ?
According to the researchers, genes might also contribute to both the composition of nasal microbiome and reaction to the cold virus.
Professor Tate explained: "The way the drug works means that we would need to be sure it was being used against the cold virus, and not similar conditions with different causes, to minimise the chance of toxic side effects."
The test drug completely blocked several strains of cold virus without appearing to harm the human cells in the lab.
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The researchers also measured participants' normal sleep habits a week prior to administering the cold virus, using a watch-like sensor that measured the quality of sleep throughout the night.
The rhinovirus (or other cold virus) enters your body through your nose or mouth and easily spreads, when you touch someone or touch common objects (the computer keyboard or mouse, the telephone receiver, a doorknob, or using utensils).
Yellow mucus is caused by white blood cells When your immune system is fighting a cold virus, one of the first symptoms is clear, runny mucus from the nose.
Granted, it may not look quite the same if you are out in company and you whip out your Andrex and rip off a 3ft length, and there is the problem of where to deposit it after use, but it does make sense in the all-out war against the cold virus.
Why doesn't everybody who's exposed to the cold virus get sick?
What new use has been found for the common cold virus? 4.
12 Archives of Internal Medicine, researchers found that people who got less than seven hours of sleep each night were nearly three times more likely than those who got eight hours or more to develop cold symptoms within five days of being exposed to a cold virus. The study included 153 healthy men and women.
The company's spray & wipe Clean & Shield products for the home and Sani-Shield products for I&I not only clean surfaces and instantly kill more than 99.9% of MRSA, E-coli, salmonella, noroviruses and the AD14 common cold virus; independent laboratory tests have also confirmed that the products simultaneously shield surfaces with a newly-patented invisible antimicrobial barrier technology on which bacteria, viruses, mold and mildew will not grow for at least seven days between cleanings.