The common cold is a viral infectious disease that usually affects the upper respiratory system along with other parts of the human body – causing runny nose, stuffy nose, sore throat, cough, mild body aches, sneezing, and body fatigue. This disease is considered one of the most common diseases affecting people globally and is the reason for a huge number of health care visits in any given year. Although it is very common and considered mild, sometimes the common cold can also cause discomfort and complications in some people, especially in those who have a very weak immune system. The common cold infection is caused primarily by a virus invading the nasal and throat passages, and it is highly contagious, as droplets are transmitted when a person coughs, sneezes, or simply talks. The viruses that have been implicated as causative agents of the common cold belong to different families, with the most common being rhinoviruses, while the contribution of other viruses such as coronaviruses, adenoviruses, and respiratory syncytial virus (RSV) to the common cold is also evident.
The primary symptoms of the common cold vary among individuals, but usually begin with a sore throat, runny or stuffy nose, followed some time later by other symptoms such as cough, sneezing, mild headache, and mild body aches. Symptom severity can be mild to moderate; typically, recovery takes 7 to 10 days. However, some individuals may experience cold symptoms for up to two weeks. In most cases, complications develop more frequently in young children, the elderly, or patients with other underlying health conditions. The common cold is not typically such a serious illness, but is potentially uncomfortable and disruptive to everyday activities, typically causing individuals to miss work, school, or social commitments.
The ways in which the common cold spreads include a variety of routes; the most effective way uses oestentricular droplets emitted when an infected person coughs, sneezes, or talks. These droplets will typically deposit on surfaces or be inhaled by others nearby, promoting further infection. The virus can also be spread through the common cold by coming into direct contact with infected surfaces or by touching contaminated objects and then touching the face, especially the nose, mouth or eyes. Good hygiene practices such as frequent hand washing are the key preventive measures to stop the spread of this disease.
The incubation period for the common cold – the time between exposure to the virus and the appearance of symptoms – averages between 24 and 72 hours. Symptoms typically reach their maximum intensity within two to three days after initial exposure to the causative organism, then gradually subside. In most cases, the common cold resolves on its own without medication; however, over-the-counter medications including decongestants, antihistamines, and pain relievers are used by some individuals to feel relief.
There is no antiviral treatment to cure a cold because a “cold” is a specific viral infection. Instead, symptom relief and comfort management for the patient is usually the focus of treatment. Rinsing the nasal passages for nasal congestion, using throat lozenges to soothe a sore throat, and managing fever and body aches with acetaminophen or ibuprofen are some examples. Hydration is additionally important as it thins mucus and activates the body's mechanisms against infection. Further advice to individuals involved is to get enough sleep to aid in the optimal functioning of their immune system.
Usually mild and self-limited, the common cold can sometimes cause complications, especially in high-risk individuals - for example, young children, people over 65 years of age, or people with weakened immune systems. They may be more likely to have complications associated with sinusitis, such as wax-filled ears, or secondary bacterial infections such as pneumonia. In people with chronic respiratory diseases such as asthma or chronic obstructive pulmonary disease (COPD), colds can bring more severe symptoms or exacerbations. This may require additional medical care, including possible antibiotics for a ruptured bacterial infection.
Preventing the common cold is very difficult. Human viruses cause common cold illnesses and spread rapidly in environments of person-to-person contact, for example, schools, workplaces, and public transportation. However, there are many things people can do to make themselves less susceptible to the common cold or reduce their chances of spreading it. Regularly washing hands with soap and water for at least 20 seconds is one of the most effective ways to prevent the spread of the virus. Avoiding close contact with sick individuals, covering coughs and sneezes with a tissue or elbow, and disinfecting frequently touched surfaces also help reduce the risk of infection.
Vaccines for the common cold and cough have not come to the market because different viruses cause the disease and these viruses mutate. It would be very difficult for manufacturers to design a vaccine-based form against the different types that cause cough. Nonetheless, research is being very actively carried out regarding the common cold and the viruses that infect it for efficient treatment and prevention in the future.
The common cold is a virus that causes an upper respiratory infection that usually causes a sore throat, runny nose, cough, and mild body aches for a short period of time. Several viruses can cause the common cold, the most common being the rhinovirus, which is highly contagious through respiratory droplets and contact with contaminated surfaces. While the common cold is mostly self-terminating and mild, it can have some serious effects in some people, and it can lead to some complications, such as sinus or ear infections. The common cold is not specifically treated, but symptomatic treatment can provide some relief, and good hygiene practices can prevent the spread of the disease. Vaccines for the common cold are not available today, as there is a huge diversity in the viruses that cause this disease. However, further study may lead to improved prevention and treatment options in the future.
