Early Plague - an in between death and pure immunity

[jpinard]

I play with Cassandra and Phoebe on "some challenge" difficulty level and I've had 2 out of 5 colonies wipe due to Plague within the first couple years of play.  Those that got it all had an interesting characteristic regarding immunity.  It trailed the disease progression so there was no chance they'd survive with max bedrest/penicillin - and they all start with the exact same %.  Some don't start with 50% vs some with 20% vs. some with 80%.  They all start at same number and always die at this point in my game.  It would be nice if people had different immunity levels so maybe some of the 6 will live.   Right now it kinda feels like a binary event.  Die or live with no in between.