Depression may weaken shingles vaccine

Got the shingles vaccine? A study has released some new information about its effectiveness or lack thereof.

The shingles shot may not work as well in people with undiagnosed depression.

In a study of nearly 100 people over the age of 60, researchers at UCLA found those who were depressed, but not on antidepressant medication, appeared to have a weaker response to the vaccine.

Experts said larger studies will be needed to determine what might be behind the link.