Sepsis is very dangerous because the symptoms can so easily be mistaken for something else. Initially you feel like it's a bad cold, headache, stomach pains. You could easily go back to bed with some paracetamol, and I have heard cases of this happening with very bad outcomes.
The flip side is that you can easily think you have it, but you don't. So you can't scare people into thinking they are severely ill, when it may just be a cold of flu. I have had at least a couple of times since I was ill, where I thought it was happening to me again. I spoke to someone a few days ago who has listened to several of my talks, and she admitted to panicking when she was not well.
Add to this the fact that it's key to get antibiotics into your system as quickly as possible. I was very lucky - I was ill enough that the symptoms were spotted straight away and I was given antibiotics within an hour. If I was less ill then this may have been missed. If I was more ill then I may not be writing this.
That's why Sepsis is so dangerous. It's my mission to help spread awareness. If everyone is aware then it may help save some more people.
Here's some more info from an article in the BBC News :-