A recent study has raised concerns about the presence of the H5N1 avian influenza virus in wastewater samples from sewer systems across the United States. The study found spikes of the virus in samples from 59 sewer systems in 18 different states, with more than 30 herds of dairy cows infected with H5N1 across nine states, according to the US Department of Agriculture.
The outbreak has led to questions about the extent of the virus spread and the ability to track it effectively. USDA officials have expressed difficulty in testing milk producers for infection, with genetic material from the H5N1 virus found in 1 out of 5 samples of milk purchased at grocery stores.
Wastewater testing has become a key tool in tracking the spread of the virus, with scientists developing a test to distinguish H5 influenza from other flu viruses in these samples. Researchers are measuring genetic markers for H5 viruses in wastewater samples near dairy cattle farms, with hopes that this method could serve as an early warning system for avian flu outbreaks in farm animals.
Although the study has been posted as a preprint and awaits review by outside experts, researchers cannot confirm the exact source of the virus in wastewater samples. They believe it may be from dumped milk or other animal waste. The FDA has stated that traces of the H5N1 virus found in pasteurized milk are not infectious, but these findings have raised ethical questions and prompted further investigation into the source of the virus in wastewater samples.
Overall, the study highlights the importance of monitoring and tracking the spread of H5N1 avian influenza virus in wastewater to prevent outbreaks in farm animals and protect public health.
“Infuriatingly humble tv expert. Friendly student. Travel fanatic. Bacon fan. Unable to type with boxing gloves on.”