World Bulletin / News Desk
Public health officials have begun examining blood samples and questionnaire results from dozens of Yosemite National Park workers who volunteered for a study designed to shed light on an unprecedented outbreak of deadly hantavirus.
This week's screening, which involved 96 workers, is the latest effort by officials to uncover clues about the rare, mouse-borne lung disease that has infected at least nine park visitors and killed three since June.
"This is a unique opportunity to learn more about potential exposure to hantavirus from the people who lived and worked in close proximity to this cluster of cases," park spokesman John Quinley said Thursday.
One aim is to help researchers design a study of the California park's more than 2,500 workers in a search for clues about how the virus infects people and how to prevent it.
Among the lingering questions over the outbreak is why hantavirus infected park visitors while sparing employees.
All but one of the nine infected visitors stayed in Curry Village in double-walled, insulated tent cabins later found to be infested with deer mice. The tiny, white-bellied mice carry the airborne virus in their droppings, urine and saliva.
The park closed the infested tent cabins at the end of August, after learning of two of the hantavirus deaths.
This week's screening will examine park workers' blood for antibodies signaling exposure to the hantavirus. Employees also answered questions about where they live, their contact with mice, their job duties and their hantavirus training, Quinley said.
"We've had a lot of employees go through hantavirus training," he said. "We're interested in knowing if the training works."
The voluntary study is part of a broader scientific effort that will include the first whole-genome sequencing for the hantavirus strain t h at struck Yosemite over the summer. It marked the biggest cluster of cases since the disease was first identified in the United States in 1993.
At that time, when hantavirus pulmonary syndrome infected healthy young adults in the Four Corners region of Utah, Colorado, Arizona and New Mexico, Navajo elders linked the outbreak to an abundance of pine nuts and an explosion of mice coming out for the feast.
Since then, more than 600 Americans have been diagnosed with hantavirus pulmonary syndrome. The incurable disease kills more than a third of those infected.
To date, humans have never been known to transmit the virus. People can inhale the hantavirus when mice droppings mix with dust, especially in confined, poorly ventilated spaces.
CDC flu season update reveals season appears to have peaked in 13 states
High levels of the flu are widespread through nearly every state in the US
Study finds compound found in asparagus can help spread deadly type of breast cancer throughout the body
Cholera outbreak has killed 83 people in the country since last October
Brussels said it was running out of patience with states -- including the EU's three biggest economies -- that had failed to take steps to improve air quality despite years of warnings.
Consignment of assorted medical supplies airlifted to Lusaka
Here is a look back at the major oil spills around the world in the past five decades:
More than 100,000 people -- half of them children -- die every year due to waterborne diseases, experts say
Located in the bustling Adjame quarter of Ivory Coast's main city and commercial hub, the haven for fake medicine has been targeted time and again by authorities and stockpiles burnt.
Seven firms to receive ecolabel certifying that their products are environment-friendly
Disasters saddle U.S. with $306 billion price tag, cause 362 deaths
Association for Prevention of Drug Abuse head says close to more than 2.5 million children are drug addicts in Bangladesh
King penguins are certainly accustomed to chilly weather, more so than species like the Humboldt that prefer somewhat warmer climes, said zoo curator Malu Celli.
Some eight million children and teenagers across the Southeast Asian nation will receive the shot to prevent further spread of the disease which is caused by a bacterial infection.
Two players vomited on the pitch, and play had to be halted briefly.