CDC's A(H5) wastewater dashboard is a warning system with an important warning label: the agency says wastewater monitoring can show a signal that animals or humans may be infected with avian influenza A(H5), but it cannot tell whether the virus came from animals, an animal product such as milk from an infected cow, or humans. [1]

That caveat is the story because wastewater has become one of the public's most tempting data streams, a community-wide pulse that is not a diagnosis, and CDC also notes that detections do not necessarily mean humans in the community are infected. [1]

MSM can turn the dashboard into a public-health update and X can turn a plus sign into proof of hidden spread, but the useful reader knows that wastewater can tell officials where to look harder without identifying a sick person, a herd, or a contaminated product.

CDC says partners investigate detections to understand what may be contributing and whether public-health actions are needed, so until that investigation separates milk, animals, farms, processing waste, lab context, sampling limits, weather effects, and humans in a particular sewershed over time and season locally, the right headline is not panic but source discipline. [1]

-- KENJI NAKAMURA, Tokyo