Respiratory syncytial
(pronounced sin-SISH-uhl) virus,
or RSV

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 for some, especially children. People with mild RSV may have symptoms for 3-8 days, but the virus can linger for several weeks. A mild cough can linger for a long time, four to eight weeks at times.

RSV can cause severe infection in some people, including babies 12 months and younger (infants), especially premature infants, older adults, people with heart and lung disease, or anyone with a weak immune system (immunocompromised).

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RSV Immunizations to Protect Infants and Toddlers

There are two ways to protect your baby from getting very sick with RSV. One is an RSV vaccine given during pregnancy. The other is an RSV immunization that provides antibodies to your baby after birth. If you receive RSV vaccine while pregnant, your baby will have protection and, in most cases, should not need an RSV immunization later.