Estimating influenza incidence and rates of influenza‐like illness in the outpatient setting
نویسندگان
چکیده
BACKGROUND Estimating influenza incidence in outpatient settings is challenging. We used outpatient healthcare practice populations as a proxy to estimate community incidence of influenza-like illness (ILI) and laboratory-confirmed influenza-associated ILI. METHODS From October 2009 to July 2010, 38 outpatient practices in seven jurisdictions conducted surveillance for ILI (fever with cough or sore throat for patients ≥ 2 years; fever with ≥ 1 respiratory symptom for patients <2 years). From a sample of patients with ILI, respiratory specimens were tested for influenza. RESULTS During the week of peak influenza activity (October 24, 2009), 13% of outpatient visits were for ILI and influenza was detected in 72% of specimens. For the 10-month surveillance period, ILI and influenza-associated ILI incidence were 20.0 (95% CI: 19.7, 20.4) and 8.7/1000 (95% CI: 8.2, 9.2) persons, respectively. Influenza-associated ILI incidence was highest among children aged 2-17 years. Observed trends were highly correlated with national ILI and virologic surveillance. CONCLUSIONS This is the first multistate surveillance system demonstrating the feasibility of using outpatient practices to estimate the incidence of medically attended influenza at the community level. Surveillance demonstrated the substantial burden of pandemic influenza in outpatient settings and especially in children aged 2-17 years. Observed trends were consistent with established syndromic and virologic systems.
منابع مشابه
Viruses associated with acute respiratory infections and influenza-like illness among outpatients from the Influenza Incidence Surveillance Project, 2010-2011.
BACKGROUND The Influenza Incidence Surveillance Project (IISP) monitored outpatient acute respiratory infection (ARI; defined as the presence of ≥ 2 respiratory symptoms not meeting ILI criteria) and influenza-like illness (ILI) to determine the incidence and contribution of associated viral etiologies. METHODS From August 2010 through July 2011, 57 outpatient healthcare providers in 12 US si...
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