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.
Despite all-out efforts to give the Chinese Communist Party blue skies for its twice-a-decade congress, Beijing's notorious smog has cloaked the mega-city in its trademark toxic haze.
Equipment donation to children's oncology institute is first project of state-run aid agency TIKA in Brazil
Some 450 other suspected cases seen in island nation; president says health workers are able to contain epidemic
UN says 900,000 doses of oral vaccine are to be given to Rohingya Muslims fleeing violence in neighboring Myanmar
3 cholera quarantine centers have been formed where victims are being treated
12 cases confirmed, 32 persons quarantined to halt spread of disease, says disease control body
Provided by UNICEF, vaccinations will be administered by public health officials in Syria’s Idlib province
Eggs tainted by the insecticide mostly originate from farms in those two countries but have since been found in 45 nations worldwide, the European health commissioner Vytenis Andriukaitisa said last week.
The UN says cholera is a major public health problem in the country with millions of cases registered every year. Last year, the disease claimed 817 lives there, according to the WHO.
The ministerial meeting will include representatives from some 30 countries, according to Canada's minister of environment and climate change, Catherine McKenna.
Cholera is endemic in Nigeria, with a rise in cases during rainy season from April to September, says disease control center
Police officers tested positive for cholera after eating infected food; health minister blames food workers
"Up to September 1, 14 deaths have been reported," the health ministry said in a statement, adding that "the total number of suspected cholera cases stands at 186."
Pharmaceutical company says treatment has more than 80 percent success rate for form of leukemia
Federal agency orders StemImmune to stop injecting vaccine into tumors of cancer patients
565,041 suspected cases of cholera have been recorded in the country since April 27