How the CDC tests wastewater for Covid-19 — and what the data says about your state

The agency now tests sewage to keep tabs on the virus. See how the process works and how viral activity in your state compares to the national trends.

​ The agency now tests sewage to keep tabs on the virus. See how the process works and how viral activity in your state compares to the national trends. Read More Breaking News, Latest News and Videos | CNN