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Volume 15, Number 3—March 2009

Research

Prevalence and Seasonality of Influenza-like Illness in Children, Nicaragua, 2005–2007

Aubree Gordon, Oscar Ortega, Guillermina Kuan, Arthur Reingold, Saira Saborio, Angel Balmaseda, and Eva HarrisComments to Author 
Author affiliations: University of California, Berkeley, California, USA (A. Gordon, A. Reingold, E. Harris); Sustainable Sciences Institute, Managua, Nicaragua (O. Ortega); Ministry of Health, Managua (G. Kuan, S. Saborio, A. Balmaseda)

Main Article

Table 2

Incidence of influenza-like illness in cohort of children 2–11 years of age, Managua, Nicaragua, 2005–2007*

Characteristic Person-years, %† ILI episodes‡ Incidence/100 person-years 95% CI
All participants 7,449.4 2,596 34.8 33.5–36.2
Year
2005–2006§ 3,704.5 1,106 29.9 28.1–31.7
2006–2007¶
3,745.0
1,490
39.8
37.8–41.9
Sex
M 3,778.7 1,280 33.9 32.1–35.8
F
3,670.7
1,316
35.9
34.0–37.8
Age, y
2 339.2 285 84.0 74.8–94.4
3 721.8 475 65.8 60.2–72.0
4 871.1 418 48.0 43.6–52.8
5 931.6 342 36.7 33.0–40.8
6 916.3 287 31.3 27.9–35.2
7 854.2 252 29.5 26.1–33.4
8 852.7 181 21.2 18.3–24.6
9 815.0 172 21.1 18.2–24.5
10 709.5 122 17.2 14.4–20.5
11
438.0
62
14.2
11.0–18.2
Asthma
Yes 447.8 322 71.9 64.5–80.2
No 7,001.7 2,274 32.5 31.2–33.8

*ILI, influenza-like illness; CI, confidence interval.
†Person-years were determined by dividing the total number of person-weeks by 52.
‡ILI was defined as an acute fever >37.8°C with cough or sore throat.
§April 16, 2005–April 15, 2006.
¶April 16, 2006–April 15, 2007.

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