What Sewage Can Tell Us About Outbreaks of Polio, Monkeypox and Covid-19 The Covid-19 pandemic renewed interest in the practice of testing sewage to track outbreaks of disease, including polio, which was declared a disaster emergency in New York.
WSJ visited a Bay Area wastewater facility to find out how testing works and what it can tell us about public health.
Photo illustration: Ryan Trefes