Weekly U.S. influenza surveillance report : 2018-2019 influenza season week 47 ending November 24, 2018
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Weekly U.S. influenza surveillance report : 2018-2019 influenza season week 47 ending November 24, 2018
Filetype[PDF-547.93 KB]

  • Description:
    All data are preliminary and may change as more reports are received. Synopsis: • Influenza activity in the United States increased slightly. The increase in the percentage of patient visits for ILI may be influenced in part by a reduction in routine healthcare visits during the Thanksgiving holidays, as has occurred in previous seasons. 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 24, 2018: o 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. o 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 to 2.3%, which is above the national baseline of 2.2%. Five of 10 regions reported ILI at or above their region-specific baseline level. • ILI State Activity Indictor Map: Two states experienced high ILI activity; three states experienced moderate ILI activity; New York City, the District of Columbia, Puerto Rico and eight states experienced low ILI activity; and 37 states experienced minimal ILI activity. • Geographic Spread of Influenza: The geographic spread of influenza in five states was reported as regional; 16 states reported local activity; the District of Columbia, Puerto Rico, the U.S. Virgin Islands and 28 states reported sporadic activity; and Guam and one state reported no influenza 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: Two influenza-associated pediatric deaths were reported to CDC for week 47.
  • Document Type:
  • Place as Subject:
  • Main Document Checksum:
  • File Type:
No Related Documents.

You May Also Like: