Latest sewage readings continue to indicate Covid-19 numbers will soon plummet, but ...

The latest sampling results from sewage at the MWRA's Deer Island plant continue to forecast the current Covid-19 surge is breaking. But the numbers are still higher than those reported at the peak of last winter's surge.

The latest confirmed-case counts from the state seem to indicate actual numbers are coming down as well.

Biobot tests samples from the plant, which handles sewage from much of greater Boston (in the chart, orange is from samples from roughly south of Rte. 9, green to the north of it), to determine how many Covid-19 viral particles it contains. In the past, the samples have predicted fluctuations in actual Covid-19 numbers a week to ten days out. The idea is that people begin to excrete the virus several days before they realize they are infected or think they need to get tested.

More from Harvard-affiliated experts.