Why is immunity gain and healing chance so impossibly random?

[Extinction]

So like the title says, i have 8 of my 9 colonists (which is stupid in of itself) get plague. I have a hospital and glittermed, 100% tend with beds at 120% immunity gain(modded) and i have 3 of my colonists 10%!!!! behind in immunity. Why? i just dont get it, Is it because i play savage and the game thinks to just kill of some colonists for no reason? Why is plague so random? I have one colonist with 60 immunity and 40 severity. Note that none of my colonists has the super immune trait and the guy falling behind at 12% is 30 years old. I dont get the system behind disease. Freaking 100% tend on a 120% immunity gain bed... I like challenge but not just outright killing me without any chance of survival

[Belkar03]

What kind of meds are you using? I tend to reserve my good quality meds for such cases.

[AlP]

You are clearly doing something wrong, or your mods are messed up.

In vanilla a level 5 medic with regular medicine and sub-100% treatment quality, with a regular bed, is enough to have an immunity gain way ahead of plague.

[MayoCulpa]

Agree with AIP, as long as you treat it right away. Unless they all wandered around untreated for several hours after getting sick, the setup you describe doesn't seem like they should fall that far behind. Mod conflict is plausible.

[martindirt]

Originally posted by Extinction:

So like the title says, i have 8 of my 9 colonists (which is stupid in of itself) get plague. I have a hospital and glittermed, 100% tend with beds at 120% immunity gain(modded) and i have 3 of my colonists 10%!!!! behind in immunity. Why? i just dont get it, Is it because i play savage and the game thinks to just kill of some colonists for no reason? Why is plague so random? I have one colonist with 60 immunity and 40 severity. Note that none of my colonists has the super immune trait and the guy falling behind at 12% is 30 years old. I dont get the system behind disease. Freaking 100% tend on a 120% immunity gain bed... I like challenge but not just outright killing me without any chance of survival

You have to tend your sick pawns as soon its available, not when the prev tend expiring. There is an around 2 hours gap between this. If you tend them when its expired (or later) you kill your colonists.

[Bar0th]

The difficulty only determines the multiplier for the infect chance (Savage = 1.0), after everything else is taken into account (wound severity, tend quality, room infection chance).

There are modifiers to ImmunityGainSpeed however.. Blood filtration (kidneys/liver), hunger, lack of rest, and age can reduce it (52 years and younger on vanilla pawns have no negatives). You can click the info icon on a pawn to check their current value, and also see what is modifying it. Blood filtration is up to a 50% reduction, so a pawn missing a kidney is in for some trouble...

And as martindirt stated, treat them constantly :) I have a night-owl medic in addition to my main one, just for tending people while the main is sleeping.