Coronavirus in Yosemite

Dozens of people in Yosemite Valley are believed to have been infected.“It’s one thing to live in denial: We live in the mountains, no one’s sick,” said Eric Sergienko, the health officer for Mariposa County, who is overseeing coronavirus testing in the Yosemite area. No visitors reported being sick since the park reopened June 11 after being closed for three months. Yosemite National Park and its beautiful wilderness, filled with gushing waterfalls and granite mountain peaks, was an oasis away from the coronavirus. More than 4 million people visit the park each year.
Monitoring wastewater for the coronavirus is helping communities track and contain the spread of COVID-19. Yosemite National Park reopened Thursday after an 83-day shutdown caused by the coronavirus pandemic.

Sergienko sees it as “another piece of the puzzle” in COVID-19 surveillance. The fresh air and open space seemed immune.That’s until local health officials started looking for the coronavirus in the park’s raw sewage — that’s right, the poop. The state also reported an additional 120 deaths.2.

Over the past few months, several private labs and universities have gotten into the business of hunting for it.What these researchers haven’t been able to do well, though, is use the genetic material to figure out definitively how widespread a viral infection is, though some like Biobot have begun to provide estimates. There were zero cases of …

We know the challenge is here. They’d like to be able to unravel such unknowns as the true scale of infections and how the virus is mutating, and do it all in real-time.“We hope by the end of this summer we’re going to have data that is actionable and complete,” she said.Her team at Stanford is analyzing wastewater samples from about 50 utilities, including many in the Bay Area.

Like a lot of the rural West, Yosemite National Park stood as a safe haven from the coronavirus.

Visitor centers remain closed, while campgrounds, gift shops and hotels are limiting services to allow for physical distancing. At least 27 people who were in contact with them are in quarantine. Coronavirus has been detected in Yosemite National Park by testing raw sewage – a science that revealed dozens of people have had COVID-19 in Yosemite …

Then they tested the park’s sewage

Now we have to be serious about facing it,” he said.For most people, the new coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. Now we have to be serious about facing it.”More than 4 million people visit Yosemite each year, from all over the world, making it ripe for the spread of the coronavirus. A Yosemite National Park resident has tested positive for COVID-19, according to an email from National Park Service leaders to some employees last week. California reported on Saturday its fourth-highest daily total of newly confirmed coronavirus cases, with more than 9,000. With no confirmed case of the coronavirus, Yosemite National Park appeared to be a safe haven from the pandemic.But tests of the park's raw sewage … “But we can now confirm it’s here.”With the pandemic surging across the country, more and more communities are keeping watch for the virus in wastewater. As foul as it may be, untreated sewage has long been used to track some of society’s most persistent ails, from illicit drugs to pollutants to disease. The virus is not believed to be infectious in the waste, but plenty of it is there so scientists can see the RNA.

The lab, Biobot Analytics, told the county this week that based on how much of the virus they counted, it’s possible about 170 people were infected in Yosemite Valley.Eric Sergienko, the county’s health officer who is overseeing coronavirus testing in the Yosemite area, attributed the emergence of the coronavirus in Yosemite to the region’s many visitors. His recent work has focused on the impacts of drought, the widening rural-urban divide and state and federal environmental policy.Before joining the Chronicle, Alexander worked as a freelance writer and as a staff reporter for several media organizations, including The Fresno Bee and Bay Area News Group, writing about government, politics and the environment.There were no reports of coronavirus in Yosemite. There were zero cases of … “Yosemite National Park is announcing modifications to operations at …

But getting more precise information from the testing, she said, is still an imperfect exercise.Boehm and others are working to improve the science.

Yosemite National Park and its beautiful wilderness, filled with gushing waterfalls and granite mountain peaks, was an oasis away from the coronavirus. Also, the district wants to know when such areas may be virus-free.“If we’re really going to stop the spread, we need good data,” she said.A working group is being set up among Northern California utilities to share sewage testing methods and results, coordinated by UC Berkeley’s Berkeley Water Center. Tests of untreated waste water from Yosemite National Park have confirmed the presence of coronavirus and the recently-reopened park is cutting the number of vehicle passes in half. In 2013, a polio flare-up was famously identified through wastewater in northern Israel, helping authorities get a jump on containing the outbreak.Scientists hope that human excrement can similarly help guide health policy today, telling them where the novel coronavirus emerges, what areas should receive medical supplies or be locked down, and when it may be safe to reopen communities, their schools, stores and businesses.Wastewater testing is seen as a complement to clinical testing, which has been hampered by test shortages, long waits for results and false negatives.

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