Des Moines Register: The amount of coronavirus floating in Des Moines area sewage has more than doubled in two weeks, a new report shows. The Des Moines Metropolitan Wastewater Authority has been sending in samples of sewage for coronavirus testing since July. Such screening offers a rough measure of how prevalent a virus is in a community. The answer in central Iowa: very prevalent. Des Moines’ latest sample, taken on Aug. 18, had a higher concentration of coronavirus than found in 85% of samples sent in by other U.S. cities, the new report says. The concentration also was more than twice what was found in Des Moines’ Aug. 4 sample, and more than seven times as much as was found in the area’s July 19 sample.