Bulletin of the World Health Organization

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).