Meningitis B is a "big killer in the UK", according to a specialist from St Mary's Hospital in London.
Professor Simon Kroll has spoken about the possibility of a new vaccine against Meningitis B being available within the year.
Scientists have been working on the vaccine for more than a decade and preliminary approval has just been granted for the jab.
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Stephen was last seen wearing a black coat, jeans, black hat and was carrying a bright blue nike bag.