Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 18, Number 9—September 2012

Demographic Shift of Influenza A(H1N1)pdm09 during and after Pandemic, Rural India

Shobha BroorComments to Author , Wayne Sullender, Karen Fowler, Vivek Gupta, Marc-Alain Widdowson, Anand Krishnan, and Renu B. Lal
Author affiliations: All India Institute of Medical Sciences, New Delhi, India (S. Broor, A. Kirshnan); University of Alabama, Birmingham, Alabama, USA (W. Sullender, K. Fowler); The Inclen Trust International, New Delhi (V. Gupta); and Centers for Disease Control and Prevention, Atlanta, Georgia, USA (M.-A. Widdowson, R.B. Lal)

Main Article

Table 1

Demographic data for persons under surveillance and incidence of febrile ARI and influenza A(H1N1)pdm09 during pandemic and postpandemic periods, Ballabgarh, India*

Demographics and test results Pandemic period, November 2009–January 2010 Postpandemic period, August–October 2010
Mean no. persons under surveillance (person-years) 7,340 (1,835) 16,396 (4,134)
No. febrile ARI episodes (incidence rate/1,000 person-years) 1,515 (826) 4,933 (1,203)

No. (%) persons tested for influenza

1,094 (72) 3,907 (79)

No. (%) positive for influenza

265 (24) 902 (23)†

No. (%) positive for influenza A(H1N1)pdm09

231 (21) 506 (13)

No. (%) positive for influenza B

34 (3) 377 (10)

Influenza incidence rate/1,000 person-years

205‡ 278
Median age, y (interquartile range)

All persons with influenza

9 (4–17) 15 (6–30)§

Persons with influenza A(H1N1)pdm09

9 (5–18) 18 (7–32)§

Persons with Influenza B

7.5 (4–16) 13 (5–27)

*ARI, acute respiratory infection.
†Total no. positive during postpandemic period included 18 persons with influenza A (H3N2) infection and 1 person co-infected with influenza B and A(H1N1)pdm09.
‡The rate of influenza positivity of sampled febrile ARI case-patients was adjusted to unsampled case-patients assuming similar characteristics for the 2 groups.
§Wilcoxon rank-sum test, p<0.001.

Main Article

Page created: August 16, 2012
Page updated: August 16, 2012
Page reviewed: August 16, 2012
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.