Riskfactors
By 2 years of age, 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 as are infants who are exposed to high levels of air pollution or cigarette smoke.
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:
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