A highly-infectious, life-threatening disease that was eradicated from the U.S. in 1979 was recently discovered in wastewater samples. Health officials said there was a confirmed case of the polio virus in New York City Monday, The Guardian reports.

The New York State Department of Health collected a sample of the infected wastewater in June, meaning that "the virus was present in the community before the Rockland county adult's diagnosis was made public on 21 July," The Guardian added. The department said, "[c]ertainly, when samples such as these are identified, it raises concerns about the potential of community spread," Reuters notes.