common cold

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.
..... Click the link for more information. , 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.

common cold

Common Cold

Definition

The common cold is a viral infection of the upper respiratory system, including the nose, throat, sinuses, eustachian tubes, trachea, larynx, and bronchial tubes. Although more than 200 different viruses can cause a cold, 30-50% are caused by a group known as rhinoviruses. Almost all colds clear up in less than two weeks without complications.

Description

Colds, sometimes called rhinovirus or coronavirus infections, are the most common illness to strike any part of the body. It is estimated that the average person has more than 50 colds during a lifetime. Anyone can get a cold, although pre-school and grade school children catch them more frequently than adolescents and adults. Repeated exposure to viruses causing colds creates partial immunity.Although most colds resolve on their own without complications, they are a leading cause of visits to the doctor and of time lost from work and school. Treating symptoms of the common cold has given rise to a multi-million dollar industry in over-the-counter medications.Cold season in the United States begins in early autumn and extends through early spring. Although it is not true that getting wet or being in a draft causes a cold (a person has to come in contact with the virus to catch a cold), certain conditions may lead to increased susceptibility. These include:

fatigue and overwork
emotional stress
poor nutrition
smoking
living or working in crowded conditions

Colds make the upper respiratory system less resistant to bacterial infection. Secondary bacterial infection may lead to middle ear infection, bronchitis, pneumonia, sinus infection, or strep throat. People with chronic lung disease, asthma, diabetes, or a weakened immune system are more likely to develop these complications.

Causes and symptoms

Colds are caused by more than 200 different viruses. The most common groups are rhinoviruses and coronaviruses. Different groups of viruses are more infectious at different seasons of the year, but knowing the exact virus causing the cold is not important in treatment.People with colds are contagious during the first two to four days of the infection. Colds pass from person to person in several ways. When an infected person coughs, sneezes, or speaks, tiny fluid droplets containing the virus are expelled. If these are breathed in by other people, the virus may establish itself in their noses and airways.Colds may also be passed through direct contact. If a person with a cold touches his runny nose or watery eyes, then shakes hands with another person some of the virus is transferred to the uninfected person. If that person then touches his mouth, nose, or eyes, the virus is transferred to an environment where it can reproduce and cause a cold.

Cold Remedies
	Symptoms	Side-effects
Antihistamines	Congestion Itchy eyes Runny nose Sneezing Stuffy nose	Drowsiness Dry mouth and eyes
Decongestants	Congestion Stuffy nose	Insomnia Rapid heart beat Stimulation

Finally, cold viruses can be spread through inanimate objects (door knobs, telephones, toys) that become contaminated with the virus. This is a common method of transmission in child care centers. If a child with a cold touches her runny nose, then plays with a toy, some of the virus may be transferred to the toy. When another child plays with the toy a short time later, he may pick up some of the virus on his hands. The second child then touches his contaminated hands to his eyes, nose, or mouth and transfers some of the cold virus to himself.Once acquired, the cold virus attaches itself to the lining of the nasal passages and sinuses. This causes the infected cells to release a chemical called histamine. Histamine increases the blood flow to the infected cells, causing swelling, congestion, and increased mucus production. Within one to three days the infected person begins to show cold symptoms.The first cold symptoms are a tickle in the throat, runny nose, and sneezing. The initial discharge from the nose is clear and thin. Later it changes to a thick yellow or greenish discharge. Most adults do not develop a fever when they catch a cold. Young children may develop a low fever of up to 102°F (38.9°C).In addition to a runny nose and fever, signs of a cold include coughing, sneezing, nasal congestion, headache, muscle ache, chills, sore throat, hoarseness, watery eyes, tiredness, and lack of appetite. The cough that accompanies a cold is usually intermittent and dry.Most people begin to feel better four to five days after their cold symptoms become noticeable. All symptoms are generally gone within ten days, except for a dry cough that may linger for up to three weeks.Colds make people more susceptible to bacterial infections such as strep throat, middle ear infections, and sinus infections. A person whose cold does not begin to improve within a week; or who experiences chest pain, fever for more than a few days, difficulty breathing, bluish lips or fingernails, a cough that brings up greenish-yellow or grayish sputum, skin rash, swollen glands, or whitish spots on the tonsils or throat should consult a doctor to see if he or she has acquired a secondary bacterial infection that needs to be treated with an antibiotic.People who have emphysema, chronic lung disease, diabetes, or a weakened immune system—either from diseases such as AIDS or leukemia, or as the result of medications, (corticosteroids, chemotherapy drugs)—should consult their doctor if they get a cold. People with these health problems are more likely to get a secondary infection.

Diagnosis

Colds are diagnosed by observing a person's symptoms. There are no laboratory tests readily available to detect the cold virus. However, a doctor may do a throat culture or blood test to rule out a secondary infection.Influenza is sometimes confused with a cold, but flu causes much more severe symptoms and generally a fever. Allergies to molds or pollens also can make the nose run. Allergies are usually more persistent than the common cold. An allergist can do tests to determine if the cold-like symptoms are being caused by an allergic reaction. Also, some people get a runny nose when they go outside in winter and breathe cold air. This type of runny nose is not a symptom of a cold.

Treatment

There are no medicines that will cure the common cold. Given time, the body's immune system will make antibodies to fight the infection, and the cold will be resolved without any intervention. Antibiotics are useless against a cold. However, a great deal of money is spent by pharmaceutical companies in the United States promoting products designed to relieve cold symptoms. These products usually contain antihistamines, decongestants, and/or pain relievers.Antihistamines block the action of the chemical histamine that is produced when the cold virus invades the cells lining the nasal passages. Histamine increases blood flow and causes the cells to swell. Antihistamines are taken to relieve the symptoms of sneezing, runny nose, itchy eyes, and congestion. Side effects are dry mouth and drowsiness, especially with the first few doses. Antihistamines should not be taken by people who are driving or operating dangerous equipment. Some people have allergic reactions to antihistamines. Common over-the-counter antihistamines include Chlor-Trimeton, Dimetapp, Tavist, and Actifed. The generic name for two common antihistamines are chlorpheniramine and diphenhydramine.Decongestants work to constrict the blood flow to the vessels in the nose. This can shrink the tissue, reduce congestion, and open inflamed nasal passages, making breathing easier. Decongestants can make people feel jittery or keep them from sleeping. They should not be used by people with heart disease, high blood pressure, or glaucoma. Some common decongestants are Neo-Synepherine, Novafed, and Sudafed. The generic names of common decongestants include phenylephrine, phenylpropanolamine, pseudoephedrine, and in nasal sprays naphazoline, oxymetazoline and xylometazoline.Many over-the-counter medications are combinations of both antihistamines and decongestants; an ache and pain reliever, such as acetaminophen (Datril, Tylenol, Panadol) or ibuprofen (Advil, Nuprin, Motrin, Medipren); and a cough suppressant (dextromethorphan). Common combination medications include Tylenol Cold and Flu, Triaminic, Sudafed Plus, and Tavist D. Aspirin should not be given to children with a cold because of its association with a risk of Reye's syndrome, a serious disease.Nasal sprays and nose drops are other products promoted for reducing nasal congestion. These usually contain a decongestant, but the decongestant can act more quickly and strongly than ones found in pills or liquids because it is applied directly in the nose. Congestion returns after a few hours.People can become dependent on nasal sprays and nose drops. If used for a long time, users may suffer withdrawal symptoms when these products are discontinued. Nasal sprays and nose drops should not be used for more than a few days. The label lists recommendations on length and frequency of use.Scientists reported in 2004 the possibility of a new oral drug for use in relieving common cold symptoms. Called pleconaril, it inhibited viral replication in at least 90% of rhinoviruses if taken within 24 hours of onset.People react differently to different cold medications and may find some more helpful than others. A medication may be effective initially, then lose some of its effectiveness. Children sometimes react differently than adults. Over-the-counter cold remedies should not be given to infants without consulting a doctor first.Care should be taken not to exceed the recommended dosages, especially when combination medications or nasal sprays are taken. Individuals should determine whether they wish to use any of these drugs. None of them shorten or cure a cold. At best they help a person feel more comfortable. People who are confused about the drugs in any over-the-counter cold remedies should ask their pharmacist for an explanation.In addition to the optional use of over the counter cold remedies, there are some self-care steps that people can take to ease their discomfort. These include:

drinking plenty of fluids, but avoiding acidic juices, which may irritate the throat
gargling with warm salt water—made by adding one teaspoon of salt to 8 oz of water—for a sore throat
not smoking
getting plenty of rest
using a cool-mist room humidifier to ease congestion and sore throat
rubbing Vaseline or other lubricant under the nose to prevent irritation from frequent nose blowing
for babies too young to blow their noses, the mucus should be suctioned gently with an infant nasal aspirator. It may be necessary to soften the mucus first with a few drops of salt water.

Alternative treatment

Alternative practitioners emphasize that people get colds because their immune systems are weak. They point out that everyone is exposed to cold viruses, but not everyone gets every cold. The difference seems to be in the ability of the immune system to fight infection. Prevention focuses on strengthening the immune system by eating a healthy diet low in sugars and high in fresh fruits and vegetables, practicing meditation to reduce stress, and getting regular moderate exercise.Once cold symptoms appear, some naturopathic practitioners believe the symptoms should be allowed to run their course without interference. Others suggest the following:

Inhaling a steaming mixture of lemon oil, thyme oil, eucalyptus, and tea tree oil (Melaleuca spp.). (Aromatherapy)
Gargling with a mixture of water, salt, and turmeric powder or astringents such as alum, sumac, sage, and bayberry to ease a sore throat. (Ayurvedic medicine)
Taking coneflower or goldenseal (Hydrastis canadensis). Other useful herbs to reduce symptoms include yarrow (Achillea millefolium), eyebright (Euphrasia officinalis), garlic (Allium sativum), and onions (Allium cepa). (Herbal)
Microdoses of Viscue album, Natrum muriaticum, Allium cepa, or Nux vomica. (Homeopathy)
Taking yin chiao (sometimes transliterated as yinquiao) tablets that contain honeysuckle and forsythia when symptoms appear. Natural herb loquat syrup for cough and sinus congestion and Chinese ephedra (ma-huang) for runny nose. (Chinese traditional medicine)
The use of zinc lozenges every two hours along with high doses of vitamin C is suggested. Some practitioners also suggest eliminating dairy products for the duration of the cold. (Nutritional therapy).

The use of zinc lozenges may be moving toward acceptance by practitioners of traditional medicine. In 1996 the Cleveland Clinic tested zinc gluconate lozenges and found using zinc in the first 24 hours after cold symptoms occurred shortened the duration of symptoms. The mechanism by which zinc worked was not clear, but additional studies are underway.At one time, the herb (Echinacea spp.) was touted as a remedy to relieve cold symptoms. However, a study published in 2004 reported that the herb failed to relieve cold symptoms in 400 children taking it and caused skin rashes in some children.

Prognosis

Given time, the body will make antibodies to cure itself of a cold. Most colds last a week to 10 days. Most people start feeling better within four or five days. Occasionally a cold will lead to a secondary bacterial infection that causes strep throat, bronchitis, pneumonia, sinus infection, or a middle ear infection. These conditions usually clear up rapidly when treated with an antibiotic.

Prevention

It is not possible to prevent colds because the viruses that cause colds are common and highly infectious. However, there are some steps individuals can take to reduce their spread. These include:

washing hands well and frequently, especially after touching the nose or before handling food
covering the mouth and nose when sneezing
disposing of used tissues properly

avoiding close contact with someone who has a cold during the first two to four days of their infection
not sharing food, eating utensils, or cups with anyone
avoiding crowded places where cold germs can spread
eating a healthy diet and getting adequate sleep

Resources

Periodicals

"Study: Echinacea Is Ineffective." Chain Drug Review February 16, 2004: 25.Zepf, Bill. "Pleconaril for Treatment of the Common Cold?" American Family Physician February 1, 2004: 703.

Key terms

Bronchial tubes — The major airways to the lungs and their main branches.Coronavirus — a genus of viruses that cause respiratory disease and gastroenteritis.Corticosteroids — A group of hormones produced naturally by the adrenal gland or manufactured synthetically. They are often used to treat inflammation. Examples include cortisone and prednisone.Eustachian tube — A thin tube between the middle ear and the pharynx. Its purpose is to equalize pressure on either side of the ear drum.Rhinovirus — A virus that infects the upper respiratory system and causes the common cold.

common cold

an acute and highly contagious virus infection of the upper respiratory tract. Cold viruses are resistant to present antibiotics, and there is currently no really effective preventive vaccine that will work against them in all situations for all people. Having had a cold confers only a brief immunity. Called also acute rhinitis.Symptoms. All colds are not identical, because of different causative agents and individual reactions. Usually the common cold starts with a runny nose, sneezing, a stuffy feeling in the head, slight headache, watering of the eyes, general aching and listlessness, inability to concentrate, and perhaps a slight fever. The affected membranes swell until the nasal passages are blocked. Often the inflammation spreads to the throat, causing sore throat and cough.
A cold usually begins to subside after several days. The nasal discharge lessens, the membranous swelling decreases and the patient is able to breathe through the nose again. The average cold lasts from 7 to 14 days. If at any stage the cold shows signs of getting worse—for example, if there are prolonged chills, fever above 39.5° C (103° F), aches in the chest, ears, or face, shortness of breath, coughing up of blood-streaked or rust-colored mucus, or persistent hoarseness—then a health care provider should be consulted.Treatment. To help avoid complications of all kinds, it is best to take a cold seriously from the beginning. Rest and isolation at the first signs will speed recovery and prevent the passing on of the cold to others. Extra hours of rest or sleep at night are important. It is important to keep warm and avoid changing temperatures as much as possible and to drink plenty of liquids and eat in moderation. The nose should be blown gently, to avoid forcing the infection into the sinuses and ears. Aspirin brings the quickest and safest relief for adults. Antibiotics are not helpful for colds. They may be prescribed if complications occur.
Sinusitis may occur when the infection spreads and causes inflammation of the membranes of the paranasal sinuses. The infection may also affect the membranes of the middle ear. Other complications may occur if the infection enters the lower respiratory system; these include laryngitis, bronchitis, and pneumonia.

common cold

n. See cold.

common cold

Acute nasopharyngitis Infectious disease A popular term for a viral URI, 2º to inflammation of the nasal mucosa–rhinitis and coryza, which is usually spread by aerosol, and caused by any of a number of viruses Agents Rhinovirus has 111 serotypes,–caused 15-40% of CCs, coronavirus, 10-20%; viral causes of CC include influenza A, B, C, parainfluenza, RSV, adenovirus, rarely coxsackie and enterovirus; group A β-hemolytic streptococci cause 2-10% of CCs; in 30-50% no etiologic agent is identified Immunity Because the CC is due to many differnt viruses, the body never builds up resistance–immunity to all of them, and CCs are a common and recurring problem Frequency Preschool children ±9 CCs/yr; kindergarten ±12 colds/yr; adolescents and adults, ± 7 colds/yr Old wives tale debunked Exposure to cold weather probably has no effect on the spread of CCs Incidence The CC affects 41/100 population/yr–US; it results in 23 million days of lost work, and a loss of $12 billion Clinical Influenza-like syndrome Management Zinc gluconate lozenges may ↓ incidence by 50% Susceptibility Psychologic stress may ↑ susceptibility to CCs

cold

(kōld) 1. A low temperature; the sensation produced by a temperature notably below an accustomed norm or a comfortable level. 2. Popular term for a virus infection involving the upper respiratory tract and characterized by congestion of the mucosa, watery nasal discharge, and general malaise, with a duration of 3-5 days.
See also: rhinitis
Synonym(s): common cold, frigid (1) , upper respiratory infection, upper respiratory tract infection.

common cold

See COLD.

Patient discussion about common cold

Q. Common cold but dreadful. I am suffering from a dreadful common cold. As I write: believe me, I long to have done with it. I am not enjoying it in the least. I fear however that I am already too old to see the day when the common cold becomes history. I tried the simple first aid tablets but no use. Could you use this session to help me out?A. chicken soup :) the best cure!
you can try fresh ginger tea - it really make it easier..opens up the sinuses, drys up the mucous.

Q. My 5 years boy is coughing for 2 weeks. What can be the problem? 5 years boy is coughing for 2 weeks. In the beginning he had a simple cold, a runny nose and fever but after 3 days those symptoms were gone and now he just the this irritating cough. What can be the problem? A. Residual cough can be a normal varient of the common cold but it can also be a sign for a more complicated disease. to distinguish between those situations you need to tell us if your boy has shortness of breath and fever or not. if not, its probably a residual part of the cold but if he does, maybe he didn't have a common cold but something more serious like pneumonia.

Q. what is the best way to treat cold ? A. Treat it's symptoms. Since the common cold is caused mainly by viruses, and is usually a self-limiting disease, there's usually no role for specific treatment. Analgesics, antipyretics and anticongestants usually do the job. Some of these are OTC and some require prescription. Remember to consult a doctor before taking any drug.
And of course the best treatment is prevention: wash your hands after touching coming in contact with sick person, before touching your eyes, eating, after sneezing or coughing etc.
You may read more here:http://www.nlm.nih.gov/medlineplus/commoncold.html

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Common cold

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common cold

Common Cold

Definition

Description

Causes and symptoms

Diagnosis

Treatment

Alternative treatment

Prognosis

Prevention

Resources

Periodicals

Key terms

common cold

common cold

common cold

cold

common cold

Patient discussion about common cold

common cold

Synonyms for common cold

noun a mild viral infection involving the nose and respiratory passages (but not the lungs)

Synonyms

Related Words