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Common cold

The common cold or upper respiratory infection (URI) is a common infectious disease of the nose and throat, the upper respiratory system. Its symptoms are sneezing, sniffing, scratchy throat, coughing and headache; they typically last for 4 to 10 days. The common cold is different from influenza, which is a more severe viral infectious disease and shows the additional symptoms of rapidly rising fever, chills, and body and muscle aches.

Table of contents
1 Pathology
2 Prevention and treatment
3 Social Impact
4 Common Remedies
5 Research
6 See also
7 External links

Pathology

The common cold is caused by several viruses (mainly rhinoviruses, coronaviruses and also certain echoviruses and coxsackieviruses). These are transmitted from person to person by droplets resulting from coughs or sneezes. The droplets are either inhaled directly, or, more commonly, transmitted from hand to hand via handshakes or door knobs, and then ingested when the hand touches the face.

The term "cold" is misleading, as the temperature does not play a role, nor are any other factors known which increase or decrease the probability of infection. Colds are somewhat more common in winter since during that time of the year people spend more time indoors in close proximity of others, increasing the infection risk. Some factors influence the severity of symptoms, for instance psychological stress and position in the menstrual cycle. Also, weak health in general, or other pre-existing conditions such as allergies can be aggravated due to infection.

The virus enters the cells of the lining of the nose and throat, and multiplies inside them. The symptoms are a result of the body's defense mechanisms: sneezes, runny nose and coughs to expel the invader, and inflammation to attract and activate immune cells. The virus takes advantage of sneezes and coughs to infect the next person just in time before it is killed by the immune system. Occasionally, other communicable diseases can be transmitted under the guise of the common cold.

Prevention and treatment

Treatment for the common cold is designed to relieve the symptoms rather than attack the cause. Common treatments include analgesics such as paracetamol (acetaminophen) as well as localised versions targeting the throat (often delivered in lozenge form), nasal decongestants (which work to reduce the inflammation in the nasal passages) and cough suppressants (which work like a narcotic to suppress the cough reflex of the brain). A warm and humid environment and drinking lots of fluids, especially hot liquids, alleviate symptoms somewhat. For most people, even without these remedies, colds are relatively minor inconveniences and they can go on with their daily activities with a little discomfort.

To prevent infection, frequent hand washing is helpful, especially if infected people are around. In some countries, people with the common cold wear surgical masks out of courtesy. Because of the large variety of viruses causing the common cold, vaccination is impractical.

Social Impact

Until the 1980s, by law, the common cold was not a reportable disease. Rarely causing death, but afflicting millions, the common cold costs companies untold billions due to time lost from work, and inefficiency on the job, as well as millions wasted on over-the-counter and home remedies. As a cold usually lasts a few days, colds interfere with absenteeism from school, as well as business.

Common Remedies

The sheer number of home remedies for the common cold serve best to demonstrate that few, if any of them are of any particular value. A cold from which the victim recovers in seven days if it is skillfully treated will clear up in a week without treatment. However, some of the most common include camomile tea, chicken soup, nebulized medicinal mixtures, hot compresses, mustard plasters, hot toddies, vitamin C, Echinacea, as well as various combinations of temperature and water.

Research

In Britain, the Common Cold Unit (CCU) was set up by the civilian Medical Research Council (MRC) in 1946 on the site of a former military hospital, the Harvard Hospital, at Harnham Down near Salisbury in Wiltshire. The CCU continually recruited volunteers for research into the common cold until its closure in 1989. The CCU is sometimes confused with the military Microbiological Research Institute (MRI) at nearby Porton Down, with which it occasionally collaborated but was not officially connected.

Reference

  • Cold Wars - The Fight Against the Common Cold, by David Tyrrell, former Director of CCU, and Michael Fielder, ISBN 019263285X

See also

External links


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