title: Update: Influenza Activity - United States and Worldwide, May 22-September 10, 2016.
abstract: During May 22-September 10, 2016,* the United States experienced typical low levels of seasonal influenza activity overall; beginning in late August, clinical laboratories reported a slight increase in influenza positive test results and CDC received reports of a small number of localized influenza outbreaks caused by influenza A (H3N2) viruses. Influenza A (H1N1)pdm09, influenza A (H3N2), and influenza B viruses were detected during May-September in the United States and worldwide. The majority of the influenza viruses collected from the United States and other countries during that time have been characterized antigenically or genetically or both as being similar to the reference viruses representing vaccine components recommended for the 2016-17 Northern Hemisphere vaccine. During May 22-September 10, 2016, 20 influenza variant virus†infections were reported; two were influenza A (H1N2) variant (H1N2v) viruses (Minnesota and Wisconsin) and 18 were influenza A (H3N2) variant (H3N2v) viruses (12 from Michigan and six from Ohio).
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Alicia
authors.initials: A
authors.lastname: Budd
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Lenee
authors.initials: L
authors.lastname: Blanton
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Krista
authors.initials: K
authors.lastname: Kniss
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Sophie
authors.initials: S
authors.lastname: Smith
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Desiree
authors.initials: D
authors.lastname: Mustaquim
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Stacy L
authors.initials: SL
authors.lastname: Davlin
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Natalie
authors.initials: N
authors.lastname: Kramer
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Brendan
authors.initials: B
authors.lastname: Flannery
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Alicia M
authors.initials: AM
authors.lastname: Fry
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Grohskopf
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Sonja J
authors.initials: SJ
authors.lastname: Olsen
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Joseph
authors.initials: J
authors.lastname: Bresee
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Wendy
authors.initials: W
authors.lastname: Sessions
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Garten
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Xiyan
authors.initials: X
authors.lastname: Xu
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Anwar Isa Abd
authors.initials: AI
authors.lastname: Elal
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Larisa
authors.initials: L
authors.lastname: Gubareva
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: John
authors.initials: J
authors.lastname: Barnes
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: David E
authors.initials: DE
authors.lastname: Wentworth
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Erin
authors.initials: E
authors.lastname: Burns
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Katz
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Daniel
authors.initials: D
authors.lastname: Jernigan
authors.affiliation: Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
authors.forename: Lynnette
authors.initials: L
authors.lastname: Brammer