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Volume 19, Number 9—September 2013
Research

Underreporting of Viral Encephalitis and Viral Meningitis, Ireland, 2005–2008

Tara A. KellyComments to Author , Piaras O’Lorcain, Joanne Moran, Patricia Garvey, Paul McKeown, Jeff Connell, and Suzanne Cotter
Author affiliations: Health Service Executive–Health Protection Surveillance Centre, Dublin, Ireland (T.A. Kelly, P. O’Lorcain, J. Moran, P. Garvey, P. McKeown, S. Cotter); National Virus Reference Laboratory, Belfield, Dublin (J. Moran, J. Connell)

Main Article

Table 1

Viral encephalitis and viral meningitis CIDR events, laboratory-confirmed cases, and patient hospitalizations by causative virus, Ireland, 2005 to 2008*

ICD code Description of code No. CIDR events No. NVRL confirmed cases HIPE data
No. discharges No. patients No. deaths Case-fatality ratio (%) Total no. bed days Mean no. bed days Mean no. ICU days
A83
Mosquito-borne encephalitis


≤5
≤5
0
0.0
≤5
≤5
0.0
A84
Tick-borne encephalitis


≤5
≤5
≤5
50.0
91
45.5
26.0
A85
Other viral encephalitis


42
25
≤5
4.0
512
12.2
1.2
A86
Unspecified viral encephalitis
4

283
223
10
4.5
4,112
14.5
1.2
B00.4
Herpesvirus encephalitis
17†
42‡
195
95
11
11.6
2,857
14.7
0.9
B01.1
Varicella encephalitis
12§
35
28
28
≤5
7.1
706
25.2
2.3
B02.0
Zoster encephalitis
43
43
8
18.6
789
18.4
1.5
B05.0
Measles encephalitis









B26.2
Mumps encephalitis
5

≤5
≤5
0
0.0
18
18.0
3.0

Enteroviral encephalitis
2








Total viral encephalitis
40
77
595
418
33
7.9%
9,086
15.3
1.2
A87.0
Enteroviral /coxsackievirus /echovirus meningitis
210¶
215#
60
52
0
0.0
428
7.1
0.8
A87.1
Adenoviral meningitis


≤5
≤5
0
0.0
25
5.0
0.6
A87.2
Lymphocytic choriomeningitis/lymphocytic meningoencephalitis


57
47
≤5
6.3
886
15.5
0.1
A87.8
Other viral meningitis


36
34
0
0.0
267
7.4
0.2
A87.9
Viral meningitis unspecified
91

1,048
990
≤5
0.1
5,701
5.4
0.1
B00.3
Herpesvirus meningitis
12**
32††
14
14
0
0.0
365
26.07
4
B01.0
Varicella meningitis
11‡‡
22
11
10
0
0.0
80
7.3
0.0
B02.1
Zoster meningitis
13
12
0
0.0
231
17.8
0.1
B05.1
Measles meningitis


≤5
≤5
0
0.0
6
6.0
0.0
B26.1
Mumps meningitis
16

≤5
≤5
0
0.0
22
4.4
0.0

Parechovirus meningitis
1








Total no. viral meningitis cases 341 269 1,250 1170 ≤5 0.3% 8,011 6.4 0.2

*CIDR, Computerised Infectious Disease Reporting system; ICD, International Classification of Diseases, 10th Revision; NVRL, National Virus Reference Laboratory; HIPE, Hospital In-Patient Enquiry; ICU, intensive care unit.
†Includes 14 herpes simplex virus (HSV), untyped; 2 HSV-1 and 1 human herpesvirus type 6 events.
‡Includes 37 HSV-1, 1 HSV-2, and 4 human herpesvirus type 6 detections.
§Includes 11 varicella-zoster and 1 varicella species events.
¶Includes 205 enterovirus, 1 coxsackie A virus, 1 coxsackie B virus, 2 echovirus, and 1 echovirus type 6 events.
#Includes 211 enterovirus, 3 coxsackie B3 virus, and 1 coxsackie B5 virus detections.
**Includes 10 HSV untyped, 1 HSV-1, and 1 HSV-2 events.
††Includes 7 HSV 1, 5 HSV 2 and 20 human herpesvirus type 6 events.
‡‡Includes 10 VZV and 1 varicella species detections.

Main Article

Page created: August 20, 2013
Page updated: August 20, 2013
Page reviewed: August 20, 2013
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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