"For nearly a year, disease detectives around the world have been trying to track down the source of a mysterious new virus in the Middle East that has infected 96 people and killed 47 since September."

"Anti-government activists in Syria are accusing President Bashar al-Assad's forces of deploying a chemical weapons attack on the suburbs of the capital, Damascus. The government denied the attack, but the allegations have prompted the United Nations to call an emergency meeting. Melissa Block talks to Washington Post reporter Loveday Morris for more."

"U.S. drugmaker Merck & Co said on Friday it is suspending sales of its Zilmax animal feed additive in the United States and Canada following concerns about animals showing signs of distress after use of the product, which is given to cattle to increase their weight before slaughter."

"Officials raise alert as 'zombie' birds fall to earth amid fears city may be in grip of avian ailment Newcastle disease."

"The Centers for Disease Control and Prevention says 300,000 Americans are getting Lyme disease every year, and the toll is growing."

"New research finds that copper in amounts readily found in our drinking water, the foods we eat and the vitamin supplements we take likely plays a key role in initiating and fueling the abnormal protein build-up and brain inflammation that are hallmarks of Alzheimer's disease."

"While the mineral is important to healthy nerve conduction, hormone secretion and the growth of bones and connective tissue, a team of researchers from the University of Rochester Medical Center suggested that too much of it may be a bad thing, and they set about to explore copper's dark side.

"A study on the fetuses of pregnant rhesus macaque monkeys has shown that exposure to the chemical bisphenol A, or BPA, led to changes in their lungs that increased the potential for developing asthma."

"The University of California at Berkeley cut laboratory financing this week for a professor who has complained for years about corporate-led retaliation for his association of health risks with a widely used herbicide."  The herbicide is atrazine.