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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 & epidemiological year, 1998/99-2009/10*
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Meningococcal Reference Unit isolates of Neisseria menengitidis: England and Wales, by serogroup & epidemiological year, 1998/99-2009/10*

Epidemiological year B C W135 Y other Ungrouped** NG*** total
1998/1999 1401 955 44 23 9 320 27 2779
1999/2000 1629 893 96 28 8 134 13 2801
2000/2001 1690 412 127 28 17 164 12 2450
2001/2002 1504 211 101 29 7 111 2 1965
2002/2003 1211 121 46 17 3 76 3 1477
2003/2004 1297 64 47 28 5 51 2 1494
2004/2005 1274 42 21 41 8 55 0 1441
2005/2006 1157 30 35 31 1 26 0 1280
2006/2007 993 29 25 35 2 49 3 1136
2007/2008 1085 29 26 29 4 74 1 1248
2008/2009 1052 13 21 58 4 17 1 1166
2009/2010 785 17 19 63 0 9 3 896

  *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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