Environmental sampling may outperform bird swabs in live poultry markets

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Environmental sampling in live poultry markets picked up a broader range of poultry viruses than direct bird swabs in a new Duke-NUS-led study from Cambodia, suggesting that air, cage, and water sampling can reveal viral circulation that routine animal testing may miss. The Nature Communications paper found that environmental samples recaptured most viruses found in poultry swabs at the same timepoint, while also detecting additional viruses, including highly pathogenic avian influenza H5N1, that were not identified in concurrently sampled birds. Air samples from slaughter and holding areas, along with cage swabs, performed especially well, and the researchers said environmental surveillance should complement rather than replace targeted bird testing. (nature.com)

Why it matters: For veterinary professionals, the findings point to a more scalable and potentially safer way to monitor live market pathogen risk, especially in settings where handling large numbers of birds is labor-intensive, costly, or difficult to sustain. That matters for avian influenza preparedness, because live bird market surveillance has already been shown to detect substantial H5 activity that passive outbreak reporting can miss, and this study suggests environmental metagenomics may widen that surveillance net further. (cdc.gov)

What to watch: Expect follow-up work on how environmental sampling can be standardized, paired with targeted animal testing, and translated into routine market surveillance programs in Southeast Asia and other high-risk regions. (nature.com)