After a person has chickenpox, the virus can lie dormant in the body for decades. 20 percent of people who have chickenpox will go on to have shingles.

The U.S. Centers for Disease Control and Prevention has recommends that adults ages 60 and older get vaccinated against shingles. The painful blisters of the disease, caused by the same virus as chickenpox, can lead to permanent nerve damage. Now, doctors have some clues about what increases your risk of getting shingles. VOA's Carol Pearson explains.