The Democratic Republic of Congo has been fighting a small Ebola outbreak since April. Now its government has given the green light to use a new Ebola vaccine.
Scientist Peter Hotez has spent nearly 40 years trying to treat and eliminate the diseases that worms can cause. And he won't let the "ick" factor stop him.
Scientists are making impressive progress in creating a vaccine for Zika. And they're using a new technology that makes vaccine development faster than ever.
Scientists worldwide face a yearly challenge in deciding what goes into the annual flu vaccine to make it effective. The job requires keeping tabs on a massive group of speedy, shape-shifting viruses.
In a small trial, an experimental vaccine protected 100 percent of people at high risk for Ebola. But more data are needed to figure out exactly how well the vaccine works.