The first human trials of a new vaccine to prevent a leading cause of serious illness in babies have been a success, say researchers. Respiratory syncytial virus (RSV) affects two-thirds of babies in their first year and is a major cause of hospital admission in the UK. Early trials of the jab, which uses a harmless virus instead, have shown promising results in adults.
Experts said that although still years off, an RSV vaccine was much needed. RSV is especially dangerous in those born prematurely or with other respiratory problems.

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