I just culled four rabbits with pastuerella. Two of them had a little bit of snot and sneezing, one had a lot, one had none. The one with a lot had organs in bad, but not terrible shape. The ones with just sneezing but not much snot both had organs in terrible shape, they're lungs where clearly barely functional and they likely were in a lot of pain. The one not showing symptoms who we culled anyway (they were all in a colony together) looked to also be in just as bad shape internally. I learned a lot from this, I thought the ones with fewer symptoms were doing okay and took longer to cull them, when I did though I realized they had clearly been suffering for a while. You have to balance the desire to hold on to a creature you love with the humane thing to do. Without a necropsy you really don't know if your rabbit is in no pain, or severe pain, and are you willing to take the risk. My partner was very attached to my colony bunnies specifically and it led to me trying harder to give them a chance, which I regretted after realizing I caused them more suffering. I'm not saying every case is like that, I'm sure it isn't, but be aware that you can't save them all and it can cause more harm to try.