I carry a genetic oddity that means should I contract pneumonia, I MUST seek medical intervention ASAP because as my GP says I go rapidly into “decompensation.” This is why I had sepsis last year, I didn’t realise the severity at the time.

Decompensation - Wikipedia:
In medicine, decompensation is the functional deterioration of a structure or system that had been previously working with the help of allostatic compensation. Decompensation may occur due to fatigue, stress, illness, or old age. When a system is “compensated,” it is able to function despite stressors or defects.