As with Covid, most children have mild symptoms but a small number need hospital treatment.
In a normal year, RSV is responsible for 20,000 hospital admissions in the under-ones - but most parents had not heard of it, the charity said.But it returned last summer, out of season, and contributed to, before another rise in cases in the autumn.
The numbers of children affected in the last week of December "had gone right down" and were "a lot lower than feared", she said. Dr Andy Whittamore, a GP and clinical lead at the British Lung Foundation, said doctors "are seeing a lot of children with coughs and viruses that weren't circulating last year".But not everyone agrees this is inevitable.
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