title: Influenza activity - United States, 2013-14 season and composition of the 2014-15 influenza vaccines.
abstract: During the 2013-14 influenza season in the United States, influenza activity increased through November and December before peaking in late December. Influenza A (H1N1)pdm09 (pH1N1) viruses predominated overall, but influenza B viruses and, to a lesser extent, influenza A (H3N2) viruses also were reported in the United States. This influenza season was the first since the 2009 pH1N1 pandemic in which pH1N1 viruses predominated and was characterized overall by lower levels of outpatient illness and mortality than influenza A (H3N2)-predominant seasons, but higher rates of hospitalization among adults aged 50-64 years compared with recent years. This report summarizes influenza activity in the United States for the 2013-14 influenza season (September 29, 2013-May 17, 2014†) and reports recommendations for the components of the 2014-15 Northern Hemisphere influenza vaccines.
authors.forename: Scott
authors.initials: S
authors.lastname: Epperson
authors.forename: Lenee
authors.initials: L
authors.lastname: Blanton
authors.forename: Krista
authors.initials: K
authors.lastname: Kniss
authors.forename: Desiree
authors.initials: D
authors.lastname: Mustaquim
authors.forename: Craig
authors.initials: C
authors.lastname: Steffens
authors.forename: Teresa
authors.initials: T
authors.lastname: Wallis
authors.forename: Rosaline
authors.initials: R
authors.lastname: Dhara
authors.forename: Michelle
authors.initials: M
authors.lastname: Leon
authors.forename: Alejandro
authors.initials: A
authors.lastname: Perez
authors.forename: Sandra S
authors.initials: SS
authors.lastname: Chaves
authors.forename: Anwar Abd
authors.initials: AA
authors.lastname: Elal
authors.forename: Larisa
authors.initials: L
authors.lastname: Gubareva
authors.forename: Xiyan
authors.initials: X
authors.lastname: Xu
authors.forename: Julie
authors.initials: J
authors.lastname: Villanueva
authors.forename: Joseph
authors.initials: J
authors.lastname: Bresee
authors.forename: Nancy
authors.initials: N
authors.lastname: Cox
authors.forename: Lyn
authors.initials: L
authors.lastname: Finelli
authors.forename: Lynnette
authors.initials: L
authors.lastname: Brammer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D014644:Genetic Variation; D006801:Humans; D007223:Infant; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification; D053122:Influenza A Virus, H3N2 Subtype / Q000235:genetics / Q000302:isolation & purification; D009980:Influenza A virus / Q000302:isolation & purification*; D009981:Influenza B virus / Q000302:isolation & purification*; D007252:Influenza Vaccines / Q000737:chemistry; D007251:Influenza, Human / Q000453:epidemiology* / Q000401:mortality / Q000517:prevention & control / Q000821:virology; D008875:Middle Aged; D010045:Outpatients / Q000706:statistics & numerical data; D011014:Pneumonia / Q000401:mortality; D011159:Population Surveillance; D012621:Seasons; D014481:United States / Q000453:epidemiology; D055815:Young Adult
chemical_list: D007252:Influenza Vaccines