Is my baby at risk?

Clinical Risk Factors

Children born prematurely or with certain lung or heart problems have a greater risk of getting a more serious RSV infection.1,2

In most children, RSV usually causes mild, cold-like symptoms. But for babies at risk, RSV may cause serious lung infections such as pneumonia and bronchiolitis, causing tiny airways in the lungs to swell and fill with mucus, making it hard to breathe.1,3,4

Hat Conditions Cause A Higher Risk Forr Serious RSV Infections?1,3,5,6

Babies born prematurely: Babies who were born prematurely (the mother’s pregnancy lasted less than 37 weeks) and are 6 months of age or younger at the beginning of the RSV season.
Children with certain types of chronic lung problems: Babies or toddlers with a certain type of chronic lung problem (doctors refer to this as bronchopulmonary dysplasia, or BPD) and are 24 months of age or younger.
Children with certain types of heart problems: Babies or toddlers born with certain types of heart problems (doctors refer to this as congenital heart disease, or CHD) and are 24 months of age or younger.

Environmental Risk Factors

There are other risk factors that could increase a baby’s chances of getting a serious RSV lung infection. These include5:
Being born smaller than usual.
Family history of asthma.
Male sex.
Mother or other family member smoking at home.
Crowded living conditions or many siblings at home.
Attending day care/siblings in day care or school.

CC-12150 / MAY 2026

1. Piedimonte G, Perez MK. Respiratory syncytial virus infection and bronchiolitis. Pediatr Rev. 2014;35(12):519-530. doi:10.1542/pir.35-12-519
2. Goldstein M, Phillips R, DeVincenzo JP, et al. National Perinatal Association 2018 Respiratory Syncytial Virus (RSV) Prevention Clinical Practice Guideline: an evidence-based interdisciplinary collaboration. Neonatology Today. 2017;12:1-27.
3. Rossi GA, Colin AA. Infantile respiratory syncytial virus and human rhinovirus infections: respective role in inception and persistence of wheezing. Eur Respir J. 2015;45(3):774-789. doi:10.1183/09031936.00062714
4. Respiratory syncytial virus (RSV). Vaccine Knowledge Project. November 22, 2019. Accessed June 23, 2020.
5. World Health Organization. Preterm birth. Accessed June 23, 2020.

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