Volume 27, Number 10—October 2021
Research
Burden of Influenza-Associated Respiratory Hospitalizations, Vietnam, 2014–2016
, Ashley L. Fowlkes1 , Ngu Duy Nghia, Tran Nhu Duong, Ngo Huy Tu, Tran Anh Tu, Jeffrey W. McFarland, Thoa Thi Minh Nguyen, Nga Thu Ha, Philip L. Gould, Pham Ngoc Thanh, Nguyen Thi Huyen Trang, Vien Quang Mai, Phuc Nguyen Thi, Satoko Otsu, Eduardo Azziz-Baumgartner, Dang Duc Anh, and A. Danielle Iuliano
Table 1
Percentages of ARI hospitalizations that met SARI case criteria from medical chart review, by age group, qualifying admission code, and province, Vietnam, 2014–2016*
| Category | No. (%) hospitalization |
||
|---|---|---|---|
| All ARI hospitalizations† | Medical record reviewed | Met SARI criteria‡ | |
| Overall |
220,217 (100) |
3,626 (100) |
2,205 (60.8) |
| Age group, y§ | |||
| <5 | 132,076 (61.0) | 1,934 (53.4) | 1,443 (74.6) |
| 5–49 | 32,112 (14.8) | 716 (19.8) | 421 (58.8) |
| 50–64 | 16,030 (7.4) | 324 (8.9) | 123 (38.0) |
| >65 |
36,329 (16.8) |
647 (17.9) |
217 (33.5) |
| Diagnosis, ICD-10 code | |||
| Acute upper respiratory infections, J06 | 37,957 (17.2) | 459 (12.7) | 325 (70.8) |
| Influenza | 4,278 (1.9) | 82 (2.3) | 30 (36.6) |
| Influenza caused by other identified influenza virus, J10 | 963 (0.4) | 36 (1.0) | 9 (25.0) |
| Influenza caused by unidentified influenza virus, J11 | 3,315 (1.5) | 46 (1.3) | 21 (45.7) |
| Pneumonia | 117,890 (53.5) | 1,946 (53.7) | 271 (13.9) |
| Viral pneumonia, not elsewhere classified, J12 | 470 (0.2) | 10 (0.3) | 7 (70.0) |
| Pneumonia caused by Streptococcus pneumoniae, J13 | 82 (0) | 9 (0.2) | 7 (77.8) |
| Pneumonia caused by Hemophilus influenzae, J14 | 51 (0) | 0 (0) | 0 (0) |
| Bacterial pneumonia, not elsewhere classified, J15 | 22,252 (10.1) | 399 (11.0) | 257 (64.4) |
| Pneumonia caused by other infectious organisms, J16 | 10,629 (4.8) | 40 (1.1) | 28 (70.0) |
| Pneumonia in diseases classified elsewhere, J17 | 65 (0) | 3 (0.1) | 3 (100.0) |
| Pneumonia, unspecified organism, J18 | 84,341 (38.3) | 1,485 (41.0) | 970 (65.3) |
| Other acute lower respiratory infections¶ | 60,092 (27.3) | 1139 (31.4) | 578 (50.7) |
| Acute bronchitis, J20 | 55,492 (25.2) | 1,096 (30.2) | 547 (49.9) |
| Acute bronchiolitis, J21 | 4,563 (2.1) | 43 (1.2) | 31 (72.1) |
| Unspecified acute lower respiratory infection, J22 |
37 (0) |
0 (0) |
0 (0) |
| Province | |||
| Dak Lak, 15 hospitals | 60,805 (27.6) | 853 (23.5) | 567 (66.5) |
| Dong Thap, 12 hospitals | 67,746 (30.8) | 828 (22.8) | 495 (59.8) |
| Khanh Hoa, 10 hospitals | 56,187 (25.5) | 854 (23.6) | 522 (61.1) |
| Quang Ninh, 14 hospitals | 35,479 (16.1) | 1,091 (30.1) | 612 (56.1) |
*ARI, acute respiratory infection; ICD-10, International Classification of Diseases, 10th Revision; SARI, severe acute respiratory infection. †Percentages show the overall proportion of patients in the listed category (column percentage). ‡Percentages show the proportion of patients with illness meeting SARI criteria (row percentage), defined as temperature of >38°C or history of fever, cough of duration <10 d, and illness requiring hospitalization; all proportions varied substantially within categories. §Age data were missing for 3,670 ARI and 5 patients with medical record review. ¶Admission ICD codes J14 and J22 were not identified among reviewed patient records; J09 was not identified among any patients.
1These authors contributed equally to this article.