Incidence of influenza-like illness and severe acute respiratory infection during three influenza seasons in Bangladesh, 2008–2010
Eduardo Azziz-Baumgartner, ASM Alamgir, Mustafizur Rahman, Nusrat Homaira, Badrul Munir Sohel, MA Yushuf Sharker, Rashid Uz Zaman, Jacob Dee, Emily S Gurley, Abdullah Al Mamun, Syeda Mah-E-Muneer, Alicia M Fry, Marc-Alain Widdowson, Joseph Bresee, Stephen Lindstrom, Tasnim Azim, Abdullah Brooks, Goutam Podder, M Jahangir Hossain, Mahmudur Rahman & Stephen P Luby
Volume 90, Number 1, January 2012, 12-19
Table 1. Demographics of patients in hospital-based influenza surveillance during three influenza seasons,a Bangladesh, 2008–2010
| Patient age and presentation | Enrolment period |
Age |
Females |
Patients positive for influenza viruses |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May–Dec 2008 | Jan–Dec 2009 | Jan–Sep 2010 | Median | IQR | No. | % | No. | % | ||||
| ILI in children < 5 years old | 274 | 392 | 312 | 1 year | 0–2b | 413 | 42 | 110 | 11 | |||
| ILI in people ≥ 5 years old | 312 | 552 | 366 | 20 years | 11–30b | 643 | 52 | 256 | 21 | |||
| SARI in children < 5 years old | 82 | 100 | 176 | 3 months | 1 mo–6 yr | 95c | 27 | 16 | 4 | |||
| SARI in people ≥ 5 years old | 21 | 236 | 238 | 37 years | 21–55 | 168 | 34 | 110 | 22 | |||
ILI, influenza-like illness; IQR, interquartile range; SARI, severe acute respiratory infection.
a The influenza season typically lasts from May to October.
b Median age differed among patients with ILI in outpatient departments and in inpatient wards (P < 0.0001).
c Of adults who presented with severe acute respiratory infection, a higher proportion were women among those who visited outpatient departments than among those who were admitted to hospital (Fisher’s exact test, P < 0.001).