Officials urge vaccination against mutated strain of virus that may be more transmissible than usual

Hospitals are bracing for a once-in-a-decade flu season, with a mutated version of the virus that is spreading widely in younger people expected to drive a wave of admissions when it reaches the elderly.

The threat has prompted NHS managers to redouble efforts to vaccinate staff and communities, expand same-day emergency care and treat more patients in the community to reduce the need for hospital stays.