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RSV, or respiratory syncytial virus, is a common virus that usually causes mild, cold-like symptoms. It is particularly important for infants and young children, as they may experience more severe effects than older individuals. RSV typically spreads through respiratory droplets, making it easy to transmit in public places or among groups.

Lungs & Respiratory
  • What exactly is RSV and how does it affect my body?
    MedlinePlusMay 2026

    RSV is a common virus that infects your respiratory system (lungs and airways) and usually causes mild, cold-like symptoms. In most people it's not serious, but it can cause serious lung infections in infants, older adults, and people with serious health problems.

  • How common is RSV in children under two years old?
    MedlinePlusMay 2026

    RSV is very common in young children—nearly all children get infected with RSV by age 2. It spreads easily through coughing, sneezing, and touching contaminated surfaces.

  • Can I catch RSV more than once, or am I immune after the first infection?
    MedlinePlusMay 2026

    You can catch RSV more than once because getting infected doesn't give you permanent immunity. However, repeat infections are usually milder than the first one.

  • Why are infants and older adults at higher risk for severe RSV infections?
    MedlinePlusMay 2026

    Infants and older adults have weaker immune systems that can't fight off the virus as well as healthy adults can. This makes it harder for their bodies to control the infection before it spreads to the lungs.

  • What can happen if RSV leads to a serious lung infection?
    MedlinePlusMay 2026

    Serious RSV lung infections can cause bronchiolitis (swelling in small airways) or pneumonia, making it hard to breathe and get enough oxygen. In severe cases, people may need hospital care and oxygen support.