The chances of getting shingles a second time is about one in three, the same as getting shingles the first time, according to WebMD. The longer the first round of shingles lasts, the greater a person's chances of developing the condition again.
The same virus that causes chicken pox causes shingles. The virus remains dormant in the nerves for decades. With compromise to the immune system, the virus reactivates again, this time affecting the nerve endings. However, WebMD indicates that the second bout of shingles often occurs in people with healthy immune systems. It is more common in women and more common when the first attack began after age 50. Immunizations can reduce the chances of a shingles attack by 50 percent.