Missouri's struggles to contain the Delta variant suggest that the rest of the U.S. is in for a rough few weeks
.) While Johnson can’t identify the first people who carried the Delta variant in Missouri, he knows roughly where they used the bathroom. Wastewater can also be a predictive tool, because the coronavirus can shed genetic material in feces days before an infected person shows symptoms—or meets up with friends at a bar.
“It was on national news how bad it was there,” says Johnson. “I was looking at whether that was going to be the same in other places. And it generally was. Almost everywhere where the Delta appeared—there was sometimes a delay, sometimes it was three weeks later—but then, pretty much without exception, it did eventually lead to this big increase.”
For example, Boone County, Missouri’s most vaccinated, is now reporting an average of 32.6 new daily cases per 100,000 people, compared with just 2.2 on Memorial Day. The city of Joplin had knocked its average daily count down to 3.4 cases per 100,000 in late March, but hasn’t dropped below 40 in the last month.
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