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Updated: Feb 14, 2026

Measuring Influenza Neutralizing Antibody Responses to AH3N2 Viruses in Human Sera by Microneutralization Assays Using MDCK-SIAT1 Cells
Published on: November 22, 2017
Update: Influenza Activity - United States, October 1, 2017-February 3, 2018
Alicia P Budd1, David E Wentworth1, Lenee Blanton1
1Influenza Division, National Center for Immunization and Respiratory Diseases, CDC.
Abstract:
Influenza activity in the United States began to increase in early November 2017 and rose sharply from December through February 3, 2018; elevated influenza activity is expected to continue for several more weeks. Influenza A viruses have been most commonly identified, with influenza A(H3N2) viruses predominating, but influenza A(H1N1)pdm09 and influenza B viruses were also reported. This report summarizes U.S. influenza activity* during October 1, 2017-February 3, 2018,† and updates the previous summary (1).
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