Several circular herpes virus particles are seen near a cell membrane. Roseola herpes virus causes a childhood illness marked by skin rashes and now has been found in brains with Alzheimer's disease.
A study finds light drinkers have the lowest combined risk of getting cancer and dying prematurely — lower than nondrinkers. Alcohol is estimated to be the third-largest contributor to overall cancer deaths.
Rita Steyn has a family history of cancer so she ordered a home genetic testing kit to see if she carried certain genetic mutations that increase the risk for the disease.
Courtesy of Rita Steyn
A serving of salmon contains about 600 IUs of vitamin D, researchers say, and a cup of fortified milk around 100. Cereals and juices are sometimes fortified, too. Check the labels, researchers say, and aim for 600 IUs daily, or 800 if you're older than 70.
Dorling Kindersley/Getty Images/Dorling Kindersley
Rinsing your produce is a good idea, but it won't give you 100 percent protection from bacteria that cause foodborne illness unless you cook it thoroughly. Because we eat lettuce raw, a lot of people got sick in a recent outbreak.
A scientist from the Nadiya Clinic in Kiev, Ukraine inserts a needle into a fertilized egg to extract the DNA of a man and woman trying to have a baby. The clinic is combining the DNA from three different people to create babies for women who are infertile.