Malaria becomes hidden in the health tab after colonists get patched.

[JustAshes]

Re-post from Steam forums:

So two of my colonists got malaria and it keeps getting cured and coming back. So basically they get the disease tended to and then it disappears from the health tab, but comes back after a few in-game hours. They still don't have 100% immunity, but I was curious if that's a bug and the thing shouldn't disappear at all until it's fully cured.

By now I found out it wasn't intended to happen and that indeed it is a bug that is presumed "fixed". It first happened with a mod, but afterwards I tested it and it still happened without the mod. I used regular medicine to patch the colonists up.

[Calahan]

This is a known bug in the current version. The bug has been fixed, which can be checked on the Mantis report https://ludeon.com/mantis/view.php?id=2986 . But the fix hasn't been released yet (that will be A18), so obviously this issue is still going to affect players until A18 arrives (no date or word on that at time of posting).

I'll close this now as this is a known issue. Thanks for reporting.