All Yosemite workers to be offered hantavirus test
FRESNO, Calif. (AP) — Yosemite National Park will offer testing to all employees at the site to determine if they have ever been infected with a deadly mouse-borne virus, officials said Thursday.
The testing to be done by state health officials will be voluntary and available to all workers for the National Park Service and its concessionaire, DNC Parks and Resort, park spokesman John Quinley said. He declined to say when the testing would start.
There have been no confirmed or suspected hantavirus cases among park employees so far, Quinley said. The park did not offer the testing earlier because public health officials did not recommend it, he said.
Nine people who visited the park this summer have been infected, the majority after staying overnight at the "Signature" cabins in Curry Village. Three of those people later died.
Between 2,500 and 3,000 people work in the park every year, depending on the season. A little less than half are National Park employees, and the rest work for the concessionaire. Many workers also live in the park.
The California Department of Public Health conducted a pilot testing program on Wednesday, taking blood samples and questionnaires from 96 employees who live or work in the El Portal area of the park.
Hantavirus is carried in the feces, urine and saliva of deer mice and other rodents, and carried on airborne particles and dust.
People can be infected by inhaling the virus or by handling infected rodents. They usually develop flu-like symptoms at first, including fever, shortness of breath, chills and muscle and body aches.
The illness can take six weeks to incubate before rapid acute respiratory and organ failure.
The tests for employees will cover all past infections, said Danielle Buttke, veterinary epidemiologist with the National Park Service. People who have been infected at any time in their lives and developed antibodies will test positive, but the test does not pinpoint time of the infection, or where the person was infected, she said.
The goal of the testing, which was proposed by public health officials, is to further the understanding of the rare virus. Park and public health officials hope to learn more about why no park employees have thus far been struck with the disease, even though many could have been exposed to it, Buttke said.
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