Volume 20, Number 5—May 2014
Dispatch
Influenza-associated Hospitalizations and Deaths, Costa Rica, 2009–2012
Table
Influenza-associated severe acute respiratory infections hospitalizations and deaths in Costa Rica, 2009–2012
| Year and age group, y | Population size | No. hospitalizations for SARI† | No. deaths‡ | No. (%) influenza-positive respiratory samples§ | Influenza-associated hospitalizations |
Influenza-associated
deaths |
|||
|---|---|---|---|---|---|---|---|---|---|
| No. (95% CI)¶ | Rate# (95% CI)¶ | No. (95% CI)¶ | Rate** (95% CI)¶ | ||||||
| 2009 | |||||||||
| <5 | 356,266 | 2,196 | 17 | 194/1,349 (14) | 436 (336–535) | 1.2 (0.9–1.5) | 2 (1–3) | 0.6 (0.3–0.8) | |
| 5–59 | 3,700,000 | 2,998 | 328 | 1,608/3,653 (44) | 1,852 (1,737–1,977) | 0.5 (0.47–0.53) | 115 (95–138) | 3.1 (2.6–3.7) | |
| ≥60 |
415,210 |
2,797 |
1,042 |
265/1,306 (20) |
657
(513–804) |
1.6
(1.2–1.9) |
171
(112–231) |
41
(27–56) |
|
| 2010 | |||||||||
| <5 | 350,902 | 2,583 | 27 | 185/1,230 (15) | 529 (366–688) | 1.5 (1.0–2.0) | 4 (2–4) | 1.1 (0.6–1.1) | |
| 5–59 | 3,800,000 | 2,595 | 317 | 507/1,472 (34) | 1,185 (993–1,378) | 0.3 (0.3–0.4) | 107 (78–133) | 2.8 (2.1–3.5) | |
| ≥60 |
444,981 |
3,073 |
1,172 |
161/879 (18) |
742
(467–1,019) |
1.7
(1.0–2.3) |
229
(123–340) |
51
(28–76) |
|
| 2011 | |||||||||
| <5 | 347,888 | 2,204 | 32 | 48/1,797 (3) | 114 (67–161) | 0.3 (0.2–0.5) | 0 | 0 | |
| 5–59 | 3,800,000 | 2,224 | 330 | 40/700 (6) | 174 (72–286) | 0.05 (0.02–0.08) | 20 (6–38) | 0.5 (0.2–1.0) | |
| ≥60 |
463,100 |
3,049 |
1,183 |
27/639 (4) |
163
(53–279) |
0.4
(0.1–0.6) |
52
(12–96) |
11
(3–21) |
|
| 2012 | |||||||||
| <5 | 344,577 | 1,927 | 22 | 79/1,526 (5) | 164 (109–216) | 0.5 (0.3–0.6) | 1 (0–2) | 0.3 (0.0–0.6) | |
| 5–59 | 3,900,000 | 2,016 | 229 | 162/1,034 (16) | 423 (307–540) | 0.1 (0.08–0.14) | 31 (18–46) | 0.8 (0.5–1.2) | |
| ≥60 |
481,557 |
2,695 |
1,051 |
76/1,012 (8) |
260
(145–381) |
0.5
(0.3–0.8) |
71
(27–118) |
15
(6–25) |
|
| Total | 18,404,481 | 30,357 | 5,750 | 3,352/16,597 (20) | 6,699 (5,165–8,264) | 0.4 (0.3–0.4) | 803 (474–1,149) | 4 (3–6) | |
*SARI, severe acute respiratory illness. Population estimates based on Costa Rica census projections.
†Number of persons hospitalized during 2009–2012 for SARI proxy diagnoses (ICD-10 code J9–18) (8) in any of 6 discharge diagnostic fields.
‡In-hospital deaths among persons hospitalized during 2009–2012 for SARI (International Classification of Diseases, 10th Revision, code J9–18) in any of 6 discharge diagnostic fields.
§Annual number of nasal and pharyngeal specimens positive for influenza by immunofluorescence and PCR over total number tested.
¶Estimated through the product of the proportion of samples testing positive for influenza and the number of persons hospitalized for or inpatient deaths from SARI each month and sum of the products by age group, Costarricense de Seguro Social, San José, Costa Rica.
#Per 1,000 person-years.
**Per 100,000 person-years.