DETROIT – Researchers are still seeking ways to screen for coronavirus (COVID-19). The testing of wastewater for evidence of COVID-19 is showing promise. READ: CDC says new guidance on airborne coronavirus transmission was ‘posted in error’The main way epidemiologists have followed the growth of the pandemic is through testing individuals. Wastewater testing will detect a problem much sooner. Yale University researchers have found wastewater can effectively be used to give an early warning of an increase in COVID-19.