Researchers in Texas detected H5N1 in wastewater from 10 cities, but the risk to humans is currently low. Ongoing surveillance is critical to monitor any potential changes in the virus that could increase its threat to public health.

Bird flu typically spreads among birds, but there have been recent outbreaks among cattle in the U.S., and one Texas man contracted the virus from sick cows. Here’s why so many experts are worried about a possible new pandemic.

The avian flu virus has been widespread in U.S. poultry as well as herds of dairy cows, raising alarms that the virus might somehow mutate and spread between people. The wastewater testing performed between May 12 and July 13 is reassuring,