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Volume 18, Number 9—September 2012

Dispatch

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 2

Incidence rates for influenza A(H1N1)pdm09 and influenza B among persons with febrile ARI during pandemic and postpandemic periods, by age group, Ballabgarh, India*

Age group, y Pandemic period, November 2009–January 2010
Postpandemic period, August–October 2010
Incidence rate ratio (95% CI)
Person-years† Febrile ARI, no. cases No. tested‡ No. (%) positive‡ Incidence (95% CI)§ Person-years† Febrile ARI, no. cases No. tested‡ No. (%) positive‡ Incidence (95% CI)§
Influenza A(H1N1)pdm09

0–5

230 499 411 71 (17.3) 375 (300–463) 498 1,174 1,036 103 (10.0) 235 (194–281) 0.6 (0.5–0.8) ¶

6–18

486 435 281 104 (37.0) 331 (282–386) 1,061 1,245 1,012 158 (15.6) 183 (158–210) 0.6 (0.4–0.7)¶

19–44

777 362 250 46 (18.4) 86 (67–110) 1,754 1,596 1,171 174 (14.9) 135 (118–153) 1.6 (1.2–2.1)#

45–59

215 135 93 9 (9.7) 61 (32–104) 493 556 413 56 (13.6) 152 (120–191) 2.5 (1.3–4.9)#

>60

128 84 59 1 (1.7) 8 (0.2–44.0) 294 362 275 15 (5.5) 68 (42–105) 8.7 (1.4–360.0)#
Influenza B

0–5

230 499 411 12 (2.9) 65 (37–108) 498 1,174 1,036 103 (10.0) 235 (194–281) 3.6 (2.1–6.6)

6–18

486 435 281 15 (5.3) 47 (30–71) 1,061 1,245 1,012 138 (13.6) 160 (137–186) 3.4 (2.2–5.5)

19–44

777 362 250 7 (2.8) 13 (6–24) 1,754 1,596 1,171 100 (8.5) 77 (65–92) 6.0 (3.2–12.8)

45–59

215 135 93 0 0 (0–17) 493 556 413 19 (4.6) 53 (34–77) 0 (0–2.9)**

>60

128 84 59 0 0 (0–29) 294 362 275 17 (6.2) 75 (47–113) 0 (0–2.4)**

*ARI, acute respiratory infection.
†For surveillance.
‡For influenza.
§Per 1,000 person-years.
¶p<0.0001 (incidence lower in postpandemic than in pandemic period).
#p<0.02 (incidence higher in postpandemic than in pandemic period).
**No influenza B–positive results for these age groups in pandemic period.

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