There is "insufficient" evidence available to support the introduction a Meningitis B immunisation, Government-appointed experts have said.
The Joint Committee on Vaccination and Immunisation (JCVI) said the efficacy of the Bexsero vaccine "has not been established" and it is "high unlikely" to be cost-effective.
The vaccine was licensed by the European Medicines Agency at the start of the year.
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Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Cheryl Grimmer vanished from inside a beach shower block in Wollongong, Australia, in 1970, when she was just three.
Pc Keith Palmer was on the front line and because of his actions, the Westminster attacker was unable to kill anyone else.