Weekly U.S. Influenza Surveillance Report
CDC's Influenza Division produces a weekly influenza surveillance report, FluView. According to this week's report (Nov 4-10), seasonal influenza activity remains at levels below baseline in the United States.
2018-2019 Influenza Season Week 45 ending November 10, 2018
Influenza activity in the United States remains low, although small increases in activity were reported. 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 since September 30, 2018. Below is a summary of the key influenza indicators for the week ending November 10, 2018:
- Viral Surveillance: Influenza A viruses have predominated in the United States since the beginning of July. The percentage of respiratory specimens testing positive for influenza in clinical laboratories was low.
- Virus Characterization: The majority of influenza viruses characterized antigenically and genetically are similar to the cell-grown reference viruses representing the 2018–2019 Northern Hemisphere influenza vaccine viruses.
- Antiviral Resistance: All viruses tested since late May show susceptibility to the antiviral drugs oseltamivir, zanamivir, and peramivir.
- Influenza-like Illness Surveillance: The proportion of outpatient visits for influenza-like illness (ILI) increased slightly to 1.9%, which is below the national baseline of 2.2%. One of 10 regions reported ILI at or above their region-specific baseline level.
- ILI State Activity Indictor Map: One state experienced moderate ILI activity, New York City and five states experienced low ILI activity; and the District of Columbia, Puerto Rico and 44 states experienced minimal ILI activity.
- Geographic Spread of Influenza: The geographic spread of influenza in three states was reported as regional; Guam and 10 states reported local activity; the District of Columbia, Puerto Rico, the U.S. Virgin Islands and 35 states reported sporadic activity; and two states reported no activity.
- Pneumonia and Influenza Mortality: The proportion of deaths attributed to pneumonia and influenza (P&I) was below the system-specific epidemic threshold in the National Center for Health Statistics (NCHS) Mortality Surveillance System.
- Influenza-associated Pediatric Deaths: No influenza-associated pediatric deaths were reported to CDC for week 45.