The proof is in the sewage: hundreds of Yosemite visitors may have had coronavirus
Yosemite national park officials suspect that hundreds of visitors this summer may have had Covid-19 thanks to an unorthodox approach – testing sewage.
The San Francisco Chronicle reported last week that the county health department has been collecting untreated wastewater flowing from the idyllic Yosemite Valley for testing. Prior to this effort, according to the Chronicle, no one had tested positive for the virus through nasal swab testing at the park’s health clinic.
Scientists at a lab called Biobot Analytics in Cambridge, Massachusetts, have examined the sewage water to determine if there are traces of genetic material from Sars-CoV-2, the coronavirus that causes Covid-19, in the human feces. From the traces in a given sample, they can estimate how many people passing through Yosemite might be infected with Covid-19 at that time.
“It just struck me as a really good idea,” said the Mariposa county health official Dr Eric Sergienko. He said that while the county was testing and monitoring local residents, “we really did not have a really good way of monitoring our visitors for Covid-19.”
https://www.yahoo.com/news/proof-sewage-hundreds-yosemite-visitors-090009437.html
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back in April. The lab that ran the tests offered an introductory discount for the service and they figured, why not? We apparently flattened the curve here in Missoula quite well and no evidence of the virus was found. Then came tourist season and we are so screwed. Cases spiking all over the state. 
