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 3. Incidence of influenza-associated influenza-like illness (ILI) per 100 person–years based on health care utilization survey data from hospital catchment areas and surveillance data for three influenza seasons, Bangladesh, 2008–2010
| Parameter | Kishorgonj | Comilla | Barisal | Bogra | Total seasonal influenza |
|---|---|---|---|---|---|
| Number of patients with ILI with samples that tested positive for influenza viruses during 2008 (numerator) | 15 | 22 | 38 | 18 | 93 |
| Census population in catchment area in 2008 (denominator) | 407 276 | 680 113 | 513 894 | 770 318 | 2 371 601 |
| Sampling fraction (i.e. surveillance 2 days per month) (denominator) | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| Patients with ILI who sought care at sentinel site during past 2 months (divided by 8 to extrapolate to 7 days)/Number with ILI during 7 days (denominator) | 4/687 | 2/528 | 7/624 | 1/596 | 14/2435 |
| Incidence of influenza-associated ILI (per 100 person–years) during 2008 |
10 |
13 |
10 |
21 |
10 |
| Number of patients with ILI whose samples tested positive for influenza viruses during 2009 (numerator) | 23 | 41 | 33 | 18 | 115 |
| Census population in catchment area during 2009 (denominator) | 413 386 | 690 315 | 521 602 | 781 873 | 2 407 175 |
| Sampling fraction (i.e. surveillance 2 days per month) (denominator) | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| Number of patients with ILI who sought care at sentinel site during past 2 months (divided by 8 to extrapolate to 7 days)/Number with ILI during 7 days (denominator) | 4/687 | 2/528 | 7/624 | 1/596 | 14/2435 |
| Incidence of influenza-associated ILI (per 100 person–years) during 2009 |
15 |
24 |
9 |
21 |
13 |
| Number of patients with ILI whose samples tested positive for influenza during 2010 (numerator) | 26 | 55 | 46 | 31 | 158 |
| Census population in catchment area in 2009 (denominator) | 419 586 | 700 669 | 529 426 | 793 601 | 2 443 283 |
| Sampling fraction (i.e. surveillance 2 days per month) (denominator) | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| Number of patients with ILI who sought care at sentinel site during past 2 months (divided by 8 to extrapolate to 7 days)/Number with ILI during 7 days (denominator) | 4/687 | 2/528 | 7/624 | 1/596 | 14/2435 |
| Incidence of influenza-associated ILI (per 100 person–years) in 2010 | 16 | 32 | 35 | 35 | 17 |