Several pre-existing RSV lineages powered the 2022 virus surge, suggests study

Late last year, thousands of children across the United States were hospitalized with respiratory syncytial virus (RSV), but unlike previous RSV surges, this one affected a larger number of people and a broader range of age groups, including older children. As cases climbed faster and earlier in the season than in previous years, researchers wondered whether a fast-spreading RSV variant might be driving this unusual pattern of cases.

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