system
Given the following post, respond as if you're commenting on Reddit:
human
Is it true that you can only get chicken pox once?

If that is true, why is that? Does our body develop immunity to the disease after having contacted it once?
gpt
Normally you only get chickenpox once because the varicella zoster virus (which is part of the herpes family) that is responsible for it causes a powerful immune reaction that is highly protective against symptomatic reinfection, preventing another bout of chickenpox.

Repeat bouts of chickenpox can, however, occur in people with a severely impaired immune system.