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Chicago covid dashboard3/7/2023 ![]() Wastewater surveillance for the virus that causes COVID-19 is a developing field. Is wastewater surveillance right for my community? State and local health officials track a variety of data and put this information together to understand the local COVID-19 situation and decide how to best respond.įind questions and answers below on recommendations to consider when implementing a wastewater-based disease surveillance system. Public health officials watch for sustained increasing levels of the virus in wastewater and use this data to inform public health decisions. More data over time can give better, more reliable trends.A change from 500,000 units to 1 million units is also a percent change of 100%. For instance, a change from 1 unit to 2 units would be a percent change of 100%. It is important to note that when levels of virus in wastewater are low, a modest increase overall in the virus level can appear much larger as numbers are translated into percentages. Early warning systems, such as wastewater surveillance, can detect small changes as a signal for early action.Communities may see change in the virus wastewater levels as prevention strategies in their areas change. Wastewater data showing the percent change in virus levels should be used along with other data such as overall levels of the virus in wastewater, historical wastewater data for that location, geographical context (for example, whether areas have high tourism or neighboring communities with increasing cases), and clinical cases. Wastewater surveillance data are most useful when used with other data.Wastewater data can be an important early warning signal and should be used alongside other data. Studying wastewater data can help scientists detect SARS-CoV-2, the virus that causes COVID-19, in a community even before data from doctor’s offices or hospitals get reported to public health officials. Data from wastewater testing support public health mitigation strategies by providing additional crucial information about the prevalence of COVID-19 in a community. Once health departments are aware, communities can act quickly to prevent the spread of COVID-19. ![]() This allows wastewater surveillance to serve as an early warning that COVID-19 is spreading in a community. The virus can then be detected in wastewater, enabling wastewater surveillance to capture presence of SARS-CoV-2 shed by people with and without symptoms. People infected with SARS-CoV-2 can shed the virus in their feces, even if they don’t have symptoms. Wastewater surveillance can provide an early warning of COVID-19’s spread in communities. NWSS is transforming independent local efforts into a robust, sustainable national surveillance system. CDC developed NWSS to coordinate and build the nation’s capacity to track the presence of SARS-CoV-2, the virus that causes COVID-19, in wastewater samples collected across the country.ĬDC’s NWSS works with health departments to track SARS-CoV-2 levels in wastewater so communities can act quickly to prevent the spread of COVID-19. In response to the COVID-19 pandemic, CDC launched the National Wastewater Surveillance System (NWSS) in September 2020. ![]() Wastewater surveillance can provide an early warning of COVID-19’s spread in communities.One study showed that, for people who already had COVID-19, those who do not get vaccinated after their recovery are more than 2 times as likely to get COVID-19 again than those who get fully vaccinated after their recovery. Getting a COVID-19 vaccine gives most people a high level of protection against COVID-19 even in people who have already been sick with COVID-19.Įmerging evidence shows that getting a COVID-19 vaccine after you recover from COVID-19 infection provides added protection to your immune system. ![]() ![]() No currently available test can reliably determine if a person is protected from infection.Īll COVID-19 vaccines currently available in the United States are effective at preventing COVID-19. Getting sick with COVID-19 offers some protection from future illness with COVID-19, sometimes called “natural immunity." The level of protection people get from having COVID-19 may vary depending on how mild or severe their illness was, the time since their infection, and their age. Yes, per CDC: You should get a COVID-19 vaccine even if you already had COVID-19. ![]()
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