By age 2, most children will have been infected with respiratory syncytial virus. Children who attend child care centers or who have siblings who attend school are at a higher risk of exposure. Susceptibility is also greater during the peak RSV season, which typically begins in the fall and ends in the spring.

People at increased risk of severe — sometimes life-threatening — infections include:

  • Infants younger than 6 months of age
  • Younger children, especially under 1 year of age, who were born prematurely or who have an underlying condition, such as congenital heart or lung disease
  • Children with weakened immune systems, such as those undergoing chemotherapy or transplantation
  • Infants in crowded child care settings
  • Older adults
  • Adults with asthma, congestive heart failure or chronic obstructive pulmonary disease
  • People with immunodeficiency, including those with certain transplanted organs, leukemia or HIV/AIDS
Jul. 08, 2014

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