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Home › Topics › Infectious Diseases › Infections A-Z › Meningococcal disease ›Epidemiological Data ›  Meningococcal Reference Unit: Isolates of Neisseria menengitidis; England and Wales, by serogroup & calendar year, 1998-2010*
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Meningococcal Reference Unit: Isolates of Neisseria menengitidis; England and Wales, by serogroup & calendar year, 1998-2010*

Calendar year B C W135 Y Other Ungrouped** NG*** Total
1998 1200 815 38  28 9 313 34 2437
1999 1462 983 50 19 10 241 19 2784
2000 1646 714 111 29 10 137 15 2662
2001 1691 320 133 31 13 136 4 2328
2002 1367 164 84 26 4 105 2 1752
2003 1364 98 42 20 7 76 3 1610
2004 1134 58 34 28 7 47 1 1309
2005 1276 27 31 38 2 40 0 1414
2006 1051 28 25 34 2 31 0 1171
2007 1099 39 32 34 2 78 3 1287
2008 1102 22 18 44 4 37 2 1229
2009 917 10 23 62 3 14 2 1031
2010 791 20 24 66 0 8 2 911

*Provisional data

**Ungrouped - this term is used for PCR reports where meningococcal DNA has been detected but further testing to determine the serogroup has not been successful.

***Not serogroupable (NG) - this term refers to isolates for which the MRU has been unable to determine an expressed capsule. These reports are unlikely as, by definition, organisms from sterile sites are generally expressing capsules. This result is often associated with throat swab or nose swab isolates.  


Last reviewed: 29 July 2011



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