title: Update: Influenza Activity--United States and Worldwide, May 24-September 5, 2015.
abstract: During May 24–September 5, 2015, the United States experienced typical low levels of seasonal influenza activity. Influenza A (H1N1)pdm09 (pH1N1), influenza A (H3N2), and influenza B viruses were detected worldwide and were identified sporadically in the United States. All of the influenza viruses collected from U.S. states and other countries during that time have been characterized antigenically and/or genetically as being similar to the influenza vaccine viruses recommended for inclusion in the 2015–16 Northern Hemisphere vaccine. During May 24–September 5, 2015, three influenza variant† virus infections were reported; one influenza A (H3N2) variant virus (H3N2v) from Minnesota in July, one influenza A (H1N1) variant (H1N1v) from Iowa in August, and one H3N2v from Michigan in August.
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Lenee
authors.initials: L
authors.lastname: Blanton
authors.forename: Krista
authors.initials: K
authors.lastname: Kniss
authors.forename: Sophie
authors.initials: S
authors.lastname: Smith
authors.forename: Desiree
authors.initials: D
authors.lastname: Mustaquim
authors.forename: Craig
authors.initials: C
authors.lastname: Steffens
authors.forename: Brendan
authors.initials: B
authors.lastname: Flannery
authors.forename: Alicia M
authors.initials: AM
authors.lastname: Fry
authors.forename: Joseph
authors.initials: J
authors.lastname: Bresee
authors.forename: Teresa
authors.initials: T
authors.lastname: Wallis
authors.forename: Rebecca
authors.initials: R
authors.lastname: Garten
authors.forename: Xiyan
authors.initials: X
authors.lastname: Xu
authors.forename: Anwar Isa Abd
authors.initials: AI
authors.lastname: Elal
authors.forename: Larisa
authors.initials: L
authors.lastname: Gubareva
authors.forename: David E
authors.initials: DE
authors.lastname: Wentworth
authors.forename: Erin
authors.initials: E
authors.lastname: Burns
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Katz
authors.forename: Daniel
authors.initials: D
authors.lastname: Jernigan
authors.forename: Lynnette
authors.initials: L
authors.lastname: Brammer
mesh_terms: D014943:Global Health / Q000706:statistics & numerical data*; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000235:genetics / Q000302:isolation & purification*; D053122:Influenza A Virus, H3N2 Subtype / Q000235:genetics / Q000302:isolation & purification*; D009981:Influenza B virus / Q000235:genetics / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology*; D011159:Population Surveillance; D012621:Seasons; D014481:United States / Q000453:epidemiology