tetano
Editor, Senior Moderator
Clinical Infectious Diseases
Influenza-Like Illness in a Community Surrounding a School-Based Outbreak of 2009 Pandemic Influenza A (H1N1) Virus?Chicago, Illinois, 2009
1. Kristen B. Janusz1,
2. Jennifer E. Cortes2,
3. Fadila Serdarevic2,3,
4. Roderick C. Jones3,
5. Joshua D. Jones3,
6. Kathleen A. Ritger3,
7. Julie Y. Morita3,
8. Susan I. Gerber3,5,
9. L. Gallagher4,
10. Brad J. Biggerstaff1,
11. Lauri A. Hicks2,
12. David L. Swerdlow2,
13. Marc Fischer1,
14. J. Erin Staples1, and
15. for the Chicago H1N1 Epidemiology Teama
+ Author Affiliations
1.
1Centers for Disease Control and Prevention, Fort Collins, Colorado
2.
2Centers for Disease Control and Prevention, Atlanta, Georgia
3.
3Chicago Department of Public Health, Chicago
4.
4Illinois Department of Public Health, Springfield
5.
5Cook County Department of Public Health, Oak Park, Illinois
1. Correspondence: Dr Erin Staples, CDC, 3150 Rampart Rd, MS P-02, Fort Collins, CO 80521 (estaples@cdc.gov.)
Abstract
In April 2009, following the first school closure due to 2009 pandemic influenza A (H1N1) (pH1N1) in Chicago, Illinois, area hospitals were inundated with patients presenting with influenza-like illness (ILI). The extent of disease spread into the surrounding community was unclear. We performed a household survey to estimate the ILI attack rate among community residents and compared reported ILI with confirmed pH1N1 cases and ILI surveillance data (ie, hospital ILI visits, influenza testing, and school absenteeism). The estimated ILI attack rate was 4.6% (95% confidence interval, 2.8%-7.4%), with cases distributed throughout the 5-week study period. In contrast, 36 (84%) of 43 confirmed pH1N1 cases were identified the week of the school closure. Trends in surveillance data peaked during the same week and rapidly decreased to near baseline. Public awareness and health care practices impact standard ILI surveillance data. Community-based surveys are a valuable tool to help assess the burden of ILI in a community.
http://cid.oxfordjournals.org/content/52/suppl_1/S94.full
Influenza-Like Illness in a Community Surrounding a School-Based Outbreak of 2009 Pandemic Influenza A (H1N1) Virus?Chicago, Illinois, 2009
1. Kristen B. Janusz1,
2. Jennifer E. Cortes2,
3. Fadila Serdarevic2,3,
4. Roderick C. Jones3,
5. Joshua D. Jones3,
6. Kathleen A. Ritger3,
7. Julie Y. Morita3,
8. Susan I. Gerber3,5,
9. L. Gallagher4,
10. Brad J. Biggerstaff1,
11. Lauri A. Hicks2,
12. David L. Swerdlow2,
13. Marc Fischer1,
14. J. Erin Staples1, and
15. for the Chicago H1N1 Epidemiology Teama
+ Author Affiliations
1.
1Centers for Disease Control and Prevention, Fort Collins, Colorado
2.
2Centers for Disease Control and Prevention, Atlanta, Georgia
3.
3Chicago Department of Public Health, Chicago
4.
4Illinois Department of Public Health, Springfield
5.
5Cook County Department of Public Health, Oak Park, Illinois
1. Correspondence: Dr Erin Staples, CDC, 3150 Rampart Rd, MS P-02, Fort Collins, CO 80521 (estaples@cdc.gov.)
Abstract
In April 2009, following the first school closure due to 2009 pandemic influenza A (H1N1) (pH1N1) in Chicago, Illinois, area hospitals were inundated with patients presenting with influenza-like illness (ILI). The extent of disease spread into the surrounding community was unclear. We performed a household survey to estimate the ILI attack rate among community residents and compared reported ILI with confirmed pH1N1 cases and ILI surveillance data (ie, hospital ILI visits, influenza testing, and school absenteeism). The estimated ILI attack rate was 4.6% (95% confidence interval, 2.8%-7.4%), with cases distributed throughout the 5-week study period. In contrast, 36 (84%) of 43 confirmed pH1N1 cases were identified the week of the school closure. Trends in surveillance data peaked during the same week and rapidly decreased to near baseline. Public awareness and health care practices impact standard ILI surveillance data. Community-based surveys are a valuable tool to help assess the burden of ILI in a community.
http://cid.oxfordjournals.org/content/52/suppl_1/S94.full