The Institute of Environmental Science and Research (ESR) found the first weak positive test result late on May 14. READ MORE:* Covid-19: Traces of Covid-19 found in wastewater treatment plant in Wellington* Covid-19: Weak positive test result in Papatoetoe wastewater, two new cases in MIQ* Poo probe: The science behind testing wastewater for the Covid-19 virusESR/Supplied 010321 NEWS PHOTO: SUPPLIED/INSTITUTE OF ENVIRONMENTAL SCIENCE AND RESEARCH. Wastewater testing for Covid-19 by ESR in Wellington. Wastewater testing for Covid-19 first started in April 2020, with the aim of giving an early warning of outbreaks or an additional surveillance tool. It is unknown at this stage why the Wellington recovered cases have produced a positive result, when other recovered cases have not.

Source: Stuff May 16, 2021 05:15 UTC