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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)

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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.

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