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. 2019 Oct 30;221(1):8–15. doi: 10.1093/infdis/jiz543

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Published by Oxford University Press for the Infectious Diseases Society of America 2019.

This work is written by (a) US Government employee(s) and is in the public domain in the US.

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Figure 1. — Geographic distribution of influenza-positive tests (n = 43 330) identified by US public health laboratories during the 2018–2019 influenza season and A(H3N2)-positive specimens submitted to the Centers for Disease Control and Prevention for genetic characterization (n = 1093), by US Department of Health and Human Services surveillance region. A, B, Influenza viruses by type and subtype and genetic clades for A(H3N2) identified from 30 September 2018 through 2 February 2019. C, D, Influenza viruses and A(H3N2) clades identified from 3 February through 18 May 2019. Pie charts present proportional distribution of virus type or A subtype (A, C) or A(H3N2) genetic clade (B, D), based on the number of subtyped or genetically characterized influenza viruses from each region.