FluView: A Weekly Influenza Surveillance Report Prepared by the Influenza Division

2018-2019 Influenza Season Week 41 ending October 13, 2018

All data are preliminary and may change as more reports are received.

An overview of the CDC influenza surveillance system, including methodology and detailed descriptions of each data component, is available at http://www.cdc.gov/flu/weekly/overview.htm.,


Influenza activity in the United States remains low. Influenza A(H1N1)pdm09, influenza A(H3N2), and influenza B viruses continue to co-circulate, with influenza A(H1N1)pdm09 viruses reported most commonly by public health laboratories during the most recent three weeks. The first influenza-associated pediatric death occurring during the 2018-2019 season was reported this week. Below is a summary of the key influenza indicators for the week ending October 13, 2018.

National and Regional Summary of Select Surveillance Components

HHS Surveillance Regions* Data for current weekPredominant flu virus reported by public health laboratories for the most recent three weeks
Out-patient ILI Number of jurisdictions reporting regional or widespread activity§ % respiratory specimens positive for flu in clinical laboratories
Nation Normal 0 of 54 0.8% Influenza A(H1N1)pdm09
Region 1 Normal 0 of 6 0.6% Influenza A
Region 2 Normal 0 of 4 0.5% No influenza positives reported
Region 3 Normal 0 of 6 0.4% Influenza A
Region 4 Normal 0 of 8 4.0% Influenza A
Region 5 Normal 0 of 6 0.5% Influenza A
Region 6 Normal 0 of 5 0.9% Influenza A
Region 7 Normal 0 of 4 0.2% Influenza A
Region 8 Normal 0 of 6 1.3% Influenza A
Region 9 Normal 0 of 5 1.1% Influenza A
Region 10 Normal 0 of 4 1.3% Influenza A

† Elevated means the % of visits for ILI is at or above the national or region-specific baseline
§ Includes all 50 states, the District of Columbia, Guam, Puerto Rico, and U.S. Virgin Islands
‡ National data are for current week; regional data are for the most recent three weeks