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Wastewater Surveillance for Influenza A Virus and H5 Subtype Concurrent with the Highly Pathogenic Avian Influenza A(H5N1) Virus Outbreak in Cattle and Poultry and Associated Human Cases - United States, May 12-July 13, 2024

Souci Louis et al. MMWR Morb Mortal Wkly Rep. .

Abstract

As part of the response to the highly pathogenic avian influenza A(H5N1) virus outbreak in U.S. cattle and poultry and the associated human cases, CDC and partners are monitoring influenza A virus levels and detection of the H5 subtype in wastewater. Among 48 states and the District of Columbia that performed influenza A testing of wastewater during May 12-July 13, 2024, a weekly average of 309 sites in 38 states had sufficient data for analysis, and 11 sites in four states reported high levels of influenza A virus. H5 subtype testing was conducted at 203 sites in 41 states, with H5 detections at 24 sites in nine states. For each detection or high level, CDC and state and local health departments evaluated data from other influenza surveillance systems and partnered with wastewater utilities and agriculture departments to investigate potential sources. Among the four states with high influenza A virus levels detected in wastewater, three states had corresponding evidence of human influenza activity from other influenza surveillance systems. Among the 24 sites with H5 detections, 15 identified animal sources within the sewershed or adjacent county, including eight milk-processing inputs. Data from these early investigations can help health officials optimize the use of wastewater surveillance during the upcoming respiratory illness season.

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Conflict of interest statement

All authors have completed and submitted the International Committee of Medical Journal Editors form for disclosure of potential conflicts of interest. John Anderson reports support from the Council of State and Territorial Epidemiologists (CSTE) for travel to the 2023 Advanced Molecular Detection Days and the 2024 Advanced Molecular Detection Academy. Alexandria B. Boehm reports institutional support from the Sergey Brin Family Foundation and grant support from the U.S. National Science Foundation for research coordination network for wastewater-based epidemiology and from the Sloan Foundation for public health partnerships and wastewater-based epidemiology, and membership on the state of California wastewater-based epidemiology committee of the State Water Board. Ruth Lynfield reports support from the Infectious Diseases Society of America, CSTE, the National Foundation for Infectious Diseases, and the American Academy of Pediatrics to attend state epidemiology meetings, ID Week, CSTE Board meetings and CSTE annual conference, National Foundation for Infectious Diseases meeting, and the Committee on Infectious Diseases meeting. Marlene K. Wolfe reports a subaward gift to Stanford University, a grant from the Rockefeller Foundation for implementation of wastewater-based epidemiology in Bangladesh and Ghana and a subaward from Ceres Nanosciences (subaward from National Institutes of Health funding) for wastewater monitoring research, and support from the American Society of Microbiology for an invited talk at a conference. No other potential conflicts of interest were disclosed.

Figures

FIGURE
FIGURE
Influenza A virus and H5 subtype testing in wastewater and sites with high levels* of influenza A virus or H5 detections reported to CDC — United States, May 12–July 13, 2024† Abbreviation: DC = District of Columbia. * Influenza A levels were categorized as being at a high (≥80th percentile compared with previous influenza season), above average (60th to <80th percentile), moderate (40th to <60th percentile), low (20th to <40th percentile), or minimal (<20th percentile) level, or as having insufficient data for analysis. https://www.cdc.gov/nwss/about-data.html † Sites with sufficient data for analysis included those that had influenza A wastewater testing data before October 1, 2023, had 10 or more samples in which influenza A was detected during October 1, 2023–March 2, 2024, had six or more samples tested during October 1, 2023–January 1, 2024, and submitted data in the 2 weeks before analysis.
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