title: Influenza-like illness in the community during the emergence of 2009 pandemic influenza A(H1N1)--survey of 10 states, April 2009.
abstract: Following the emergence of 2009 pandemic influenza A(H1N1) virus (pH1N1) in the United States, the incidence of pH1N1 in the community was unclear, because not all persons with influenza come to medical attention. To better estimate the incidence of pH1N1 in the community early in the pandemic, a telephone survey was conducted in 10 states. The community incidence of influenza-like illness in April 2009 was 4.7 per 100 adults (95% confidence interval: 2.8-6.6); half of adults reported seeking medical care for their illness. Such surveys may be important tools for assessing the level of illness in the general population, including those who do not seek medical care and are thus not captured using traditional surveillance methods.
authors.affiliation: Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA. creed1@cdc.gov
authors.forename: Carrie
authors.initials: C
authors.lastname: Reed
authors.forename: Frederick J
authors.initials: FJ
authors.lastname: Angulo
authors.forename: Matthew
authors.initials: M
authors.lastname: Biggerstaff
authors.forename: David
authors.initials: D
authors.lastname: Swerdlow
authors.forename: Lyn
authors.initials: L
authors.lastname: Finelli
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D017714:Community-Acquired Infections / Q000453:epidemiology / Q000821:virology; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D007407:Interviews as Topic; D008297:Male; D008875:Middle Aged; D058873:Pandemics; D011159:Population Surveillance / Q000379:methods*; D014481:United States / Q000453:epidemiology; D055815:Young Adult