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The NHS offers the RSV vaccine from 28 weeks of pregnancy in every pregnancy, and 1 dose to adults 75 and over. Vaccination in pregnancy protects the baby for the first 6 months; people aged 65 to 74 qualify with a weakened immune system or a long-term lung condition.

The NHS describes bronchiolitis as a common chest infection in babies and children under 2. It starts like a cold, is usually worst on days 3 to 5, and the cough usually gets better in 3 weeks. It's usually caused by RSV; babies under 6 months are at higher risk, and difficulty breathing, pauses in breathing or blue lips need 999.

The CDC describes RSV as a common virus infecting the nose, throat and lungs. Runny nose, cough, fever and wheezing appear in stages 4 to 6 days after infection, and most infections clear in a week or two. People are usually contagious for 3 to 8 days, some babies for 4 weeks or longer, and infants under 6 months and older adults are most at risk.