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Croup (/ k r uː p / KROOP), also known as croupy cough, is a type of respiratory infection that is usually caused by a virus. [2] The infection leads to swelling inside the trachea, which interferes with normal breathing and produces the classic symptoms of "barking/brassy" cough, inspiratory stridor and a hoarse voice. [2]
In cases that progress beyond a throat infection, diphtheria toxin spreads through the blood, and can lead to potentially life-threatening complications that affect other organs, such as the heart and kidneys. Damage to the heart caused by the toxin affects the heart's ability to pump blood, or the kidneys' ability to clear wastes.
The viruses have a tendency towards different complications: influenza is more likely to cause severe pneumonia in high-risk groups; parainfluenza is more likely to cause croup in children. Influenza has effective vaccines available and can be treated with antiviral medications like neuraminidase inhibitors.
Viruses typically seen in the winter, including respiratory syncytial virus and croup, are surging among children at the height of summer.
These viruses usually spread by coughing and sneezing. Enteroviruses are often mild, and can cause a range of symptoms, including rashes, fever, loss of appetite and sore throat.
The common cold is an infection of the upper respiratory tract which can be caused by many different viruses. The most commonly implicated is a rhinovirus (30–80%), a type of picornavirus with 99 known serotypes. [33] Other commonly implicated viruses include coronaviruses, adenoviruses, enteroviruses, parainfluenza and RSV. [34]
Colder temperatures, especially in winter months, won’t cause a common cold. But they can weaken your immune system, and colder, drier air can help respiratory viruses thrive.
Respiratory syncytial virus (RSV), [a] also called human respiratory syncytial virus (hRSV) and human orthopneumovirus, is a contagious virus that causes infections of the respiratory tract. It is a negative-sense, single-stranded RNA virus. [2] Its name is derived from the large cells known as syncytia that form when infected cells fuse. [2] [3]
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