dunno if this will help or if it's even a thing, but i've been playing EXP branch a bit and 4 out of the last 5? spawns i've gotten sick pretty much instantly but this last run i changed up my routine and i've stayed healthy the entire time - i just took off running like a bat of hell to keep my temperature up after i spawned, prioritized finding any and all necessary clothing, and stayed dry pretty much the entire time, even when it started raining i made sure to stay dry by staying indoors and lighting fires, haven't been sick yet

disinfected bandages only, never eat or drink with bloody hands, avoid all mushrooms whether cooked or not - so far so good