(CNN) - New Covid-19 infections are no longer being tracked and reported as closely as they were during the public health emergency. Instead, U.S. officials are now focusing on testing the contents of U.S. wastewater to contain the virus.
To determine virus levels and broader trends , the U.S. Centers for Disease Control and Prevention relies on an extensive network of sampling sites at wastewater treatment plants across the country. The surveillance network covers approximately 43% of the population.
The process does not accurately count the number of cases and measurements may vary depending on the wastewater flow at a particular location or the characteristics of a particular variant at a particular time. But it serves as an early warning of the spread of the virus, according to CDC officials . CNN tracks these numbers weekly across the country and by state, and this page is automatically updated as the agency releases new information.
The virus concentration varies depending on time and place. This table shows trends by state, in ascending order of severity of virus activity during the most recent testing period.
Samples will be collected from sampling sites throughout the United States that meet criteria for adequate data anonymization. The sample survey allows the CDC to see results from a broad view of the population, not just those who are part of the health care system. Wastewater data also helps local health authorities track new Covid variants and other infectious diseases such as RSV and MPOX.
The agency reports the percentage change in virus levels in each location where data was collected over a 15-day period, and some densely populated states have more testing sites than others. This map shows these places. Some sites saw an increase in activity while others saw a decrease.
The CNN Wire
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