Haemophilus influenzae type b ( Hib ) is a bacterium that can cause a number of serious illnesses, particularly in young children.

Hib infections used to be a serious health problem in the UK, but the routine immunisation against Hib , given to infants since 1992, means these infections are now rare.

Of the small number of cases that do occur nowadays, most affect adults with long-term (chronic) underlying medical conditions, rather than young children.

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Medically Reviewed by a doctor on 11 Nov 2016