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
||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).