Human respiratory syncytial virus (RSV) is a negative sense, single-stranded RNA virus of the family Paramyxoviridae, which includes common respiratory viruses such as those causing measles and mumps. RSV is a member of the paramyxovirus subfamily Pneumovirinae.
RSV causes respiratory tract infections in patients of all ages. It is the major cause of lower respiratory tract infection during infancy and childhood. In temperate climates there is an annual epidemic during the winter months. In tropical climates, infection is most common during the rainy season. In the United States, 60% of infants are infected during their first RSV season, and nearly all children will have been infected with the virus by 2-3 years of age. Natural infection with RSV does not induce protective immunity, and thus people can be infected multiple times. Sometimes an infant can become symptomatically infected more than once even within a single RSV season. More recently, severe RSV infections have increasingly been found among elderly patients as well.
For most people, RSV produces only mild symptoms, often indistinguishable from common colds and minor illnesses. RSV is also a common cause of pneumonia for young children. For some children, RSV can cause bronchiolitis, leading to severe respiratory illness requiring hospitalization and, rarely, causing death. This is more likely to occur in patients that are immunocompromised or infants born prematurely.
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Childrens' Respiratory Disorders

CDC - Respiratory Syncytial Virus - Factsheet with cause, symptoms, treatment, and prevention.
Kidshealth: Respiratory Syncytial Virus - Signs of this common infection, recommended treatment, and when to call the doctor.
Meta Description: [ Respiratory syncytial virus (RSV) is a major cause of respiratory illness in young children. Read this article for parents to learn how to recognize the signs and symptoms of this contagious infection. ]
Manitoba Public Health: Communicable Disease Management Protocol: RSV - Clinical presentation, etiology, epidemiology, diagnosis, and control. 87 kB pdf document.
MedlinePlus Medical Encyclopedia: Respiratory syncytial virus - Includes cause, symptoms, risk factors, diagnosis, treatment, complications, and prevention.
MedlinePlus: Respiratory Syncytial Virus Infections - Directory of factsheets, news reports, and articles.
Meta Description: [ Respiratory Syncytial Virus Infections ]
PreemieCare: Respiratory Syncytial Virus (RSV) - Awareness and prevention information for parents of premature babies, includes parent stories.
Respiratory Syncytial Virus - Learn how to recognize the signs and symptoms of this contagious infection.
Meta Description: [ Respiratory syncytial virus (RSV) is a major cause of respiratory illness in young children. Read this article for parents to learn how to recognize the signs and symptoms of this contagious infection. ]
Respiratory Syncytial Virus (RSV) Facts - Summary of symptoms, treatment, and other facts.
RSV Care - Signs and symptoms of Respiratory Syncytial Virus (RSV). Recommends the use of Synagis brand antibody shots to prevent the disorder in premature babies, who are more prone to severe complications. From Caremark, a pharmaceutical management company.
RSV Info Center - Diagnosing and management of respiratory syncytial virus. Includes resources for healthcare providers.
RSV: A Serious Threat to Infants and Children - General overview of the virus, and recommended ways to avoid spreading it. From the American Academy of Pediatrics.
RSVMD.com - Information about RSV disease for healthcare professionals. Site is sponsored by MedImmune, Inc., maker of Synagis (palivizumab).
Meta Description: [ Get detailed information about respiratory syncytial virus (RSV) and the role of Synagis in preventing severe RSV disease in premature infants and other at-risk babies and children. ]
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