Meningococcal disease is caused by invasive infection with the bacterium Neisseria meningitidis, also known as the meningococcus.
There are 12 identified serogroups of which groups B, C, W and Y were historically the most common in the UK.
Since the introduction of the routine MenC vaccination programme, cases of invasive meningococcal disease in the UK due to serogroup C have reduced dramatically.
Joint PHE and NHS England letter announcing the MenC vaccination schedule changes.
Please refer to the Green Book chapters on meningococcal disease.