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.

What is RSV B?

Respiratory Syncytial Virus (RSV) Infection

Respiratory syncytial (sin-SISH-uhl) virus, or RSV, is a common respiratory virus that usually causes mild, cold-like symptoms. Most people recover in a week or two, but RSV can be serious, especially for infants and older adults.

Is RSV B contagious?

Yes, RSV is highly contagious — particularly during the three- to seven-day period a person has symptoms. Some infants and people with weakened immune systems may remain contagious for as long as four weeks.

Although there are no significant differences in severity between RSV-A and B in full term population, RSV-A is prevalent and causes most of the severe cases in premature infants. Furthermore, an increase in numbers of severe bronchiolitis RSV-related is evident not only in the premature population.