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

2018-2019 Influenza Season Week 40 ending October 6, 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.,


The Centers for Disease Control and Prevention’s (CDC) Influenza Division collects, compiles, and analyzes information on influenza activity year-round in the United States and produces FluView, a weekly influenza surveillance report, and FluView Interactive , an application to customize the presentation of influenza surveillance data. The U.S. influenza surveillance system provides information in five categories collected from eight data sources. This is the first report of the 2018-19 influenza season.

The five categories and eight data components of CDC influenza surveillance are:


Influenza activity in the United States remained low throughout the summer months and early October.

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 0.9% Influenza A
Region 1 Normal 0 of 6 0.3% Influenza A
Region 2 Normal 0 of 4 0.4% Influenza A
Region 3 Normal 0 of 6 0.5% Influenza A
Region 4 Normal 0 of 8 3.1% Influenza A
Region 5 Normal 0 of 6 0.6% Influenza A
Region 6 Normal 0 of 5 1.2% Influenza A
Region 7 Normal 0 of 4 0.4% Influenza A
Region 8 Normal 0 of 6 1.5% Influenza A
Region 9 Normal 0 of 5 0.6% Influenza A
Region 10 Normal 0 of 4 1.2% 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