title: Epidemiology of 2009 pandemic influenza A (H1N1) in the United States.
abstract: In April 2009, the Centers for Disease Control and Prevention confirmed 2 cases of 2009 pandemic influenza A (H1N1) virus infection in children from southern California, marking the beginning of what would be the first influenza pandemic of the twenty-first century. This report describes the epidemiology of the 2009 H1N1 pandemic in the United States, including characterization of cases, fluctuations of disease burden over the course of a year, the age distribution of illness and severe outcomes, and estimation of the overall burden of disease.
authors.affiliation: Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, USA. mjhung@cdc.gov
authors.forename: Michael A
authors.initials: MA
authors.lastname: Jhung
authors.forename: David
authors.initials: D
authors.lastname: Swerdlow
authors.forename: Sonja J
authors.initials: SJ
authors.lastname: Olsen
authors.forename: Daniel
authors.initials: D
authors.lastname: Jernigan
authors.forename: Matthew
authors.initials: M
authors.lastname: Biggerstaff
authors.forename: Laurie
authors.initials: L
authors.lastname: Kamimoto
authors.forename: Krista
authors.initials: K
authors.lastname: Kniss
authors.forename: Carrie
authors.initials: C
authors.lastname: Reed
authors.forename: Alicia
authors.initials: A
authors.lastname: Fry
authors.forename: Lynnette
authors.initials: L
authors.lastname: Brammer
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Gindler
authors.forename: William J
authors.initials: WJ
authors.lastname: Gregg
authors.forename: Joseph
authors.initials: J
authors.lastname: Bresee
authors.forename: Lyn
authors.initials: L
authors.lastname: Finelli
mesh_terms: D017677:Age Distribution; D005843:Geography; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology / Q000821:virology; D058873:Pandemics; D012307:Risk Factors; D012621:Seasons; D016019:Survival Analysis; D013997:Time Factors; D014481:United States / Q000453:epidemiology