Volume 19, Number 9—September 2013
Research
Underreporting of Viral Encephalitis and Viral Meningitis, Ireland, 2005–2008
, Piaras O’Lorcain, Joanne Moran, Patricia Garvey, Paul McKeown, Jeff Connell, and Suzanne Cotter
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.