system
Given the following post, respond as if you're commenting on Reddit:
human
Does surviving a viral infection always result in immunity?

Let's take ebola, for example.  I've ready that it has about a 10% survival rate.  Do those survivors become immune for life, or can they get re-infected and suffer symptoms again?
gpt
Plain and simple: No. There is no 100% secure immunity when it comes to infections or infectious diseases.

Take the EBV (infectious mononucleosis). Years ago the credo was that if once gone though a mononucleosis, you're safe for at least 25 years. Today we know, that there's a high probability that you'll never catch it again after being infected once, some time in your life. But there are documented cases where patients with no other conditions or any immune suppressive circumstances (like medication or other illness) catched it again and went through another cycle of infectious mononucleosis.

Also, there are virus infections like herpes. It's just not curable. It's treatable, but once the current infection has been "defeated" the virus itself persists in tbe body, just to wait for another opportunity to become active again and give you another hard time, another active infection.