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Organizations
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Wikipedia
World Health Organization
Infant
Respiratory syncytial virus (RSV) is a single-stranded negative-sense RNA enveloped virus. Infections are ubiquitous in nature, and the virus causes seasonal outbreaks throughout the world. Typically, these occur in the northern hemisphere from November to April, with a peak in January or February. In the southern hemisphere, epidemics take place from May to September, with a peak in May, June, or July.
Transmission occurs after coming into contact with fomites or secretions containing the virus, with primary sites of inoculation being the nasopharyngeal passages and the ocular mucous membranes. While direct contact is known to be the most common mode of transmission, large aerosol droplets have also been implicated. Hand washing and contact precautions are important infection control measures to prevent nosocomial transmission, as the virus can survive for several hours on hands and fomites. Disease incubation usually takes 4-6 days.
RSV causes acute respiratory tract illness in both immunocompetent and immunocompromised hosts irrespective of age. It is the most common cause of acute upper respiratory tract infection (URTI) and lower respiratory tract infection (LRTI) in childhood. Disease severity, including mortality rate, is highest in hematopoietic stem cell transplant (HSCT) recipients; the estimated mortality rate in treated and untreated individuals with stem cell transplant is around 60%. The risk is known to be especially high during the engraftment period. For solid organ transplant (SOT) recipients, the risk is intermediate between those of immunocompetent hosts and HSCT recipients. However, a study of SOT recipients showed that despite a high rate of hospitalization and ICU care, RSV-related mortality was not as high as once reported (up to 33% in lung transplant recipients).
This viral illness may manifest differently depending on patient age, health status, and whether this is a primary infection or a secondary one. Among infants and young children with primary infection, the disease may present as LRTI with bronchiolitis or pneumonia. In 20% of infants presenting to the hospital, apnea may be the presenting symptom. Apnea is more likely to be seen in premature infants and in those with severe hypoxemia. Older children and adults are more likely to present with symptoms of URTI or tracheobronchitis. RSV is also known to be an important factor leading to acute otitis media in young children with bronchiolitis. However, in elderly or immunocompromised adults, these conditions may progress to a severe LRTI. In a study of adult SOT recipients, the most common symptoms were fever, cough, and dyspnea. Less common symptoms included rhinorrhea and wheezing.
Patients at risk for developing RSV-related LRTI are:
Infants younger than 6 months of age, particularly those who are born during the first half of the RSV season and those attending daycare
Infants and children with underlying lung disease, such as bronchopulmonary dysplasia
Infants born before 35 weeks of gestation
Infants and children with congenital heart disease
Infants exposed to secondhand smoke
Immunocompromised patients (eg, individuals with severe combined immunodeficiency, leukemia, or bone marrow or lung transplant)
Patients of any age group with significant asthma
Adults with cardiopulmonary disease
Elderly patients with chronic obstructive pulmonary disease (COPD)
Codes
ICD10CM: B97.4 – Respiratory syncytial virus as the cause of diseases classified elsewhere