In 2009/10 there were 896 cases of meningococcal disease confirmed in England and Wales. 785 of these cases were confirmed as Group B and only 17 as Group C. It's not known why some people became ill while others remained symptomless 'carriers' of the bacteria.
- Disease can occur at any age. However, most cases occur in children under four.
- The next highest incidence is recorded for teenagers between 15 and 19 years of age
- Most cases occur without any connection to other cases (sporadic cases), sometimes two or more cases are connected by those affected having close contact.