Why vampires don't like marzipan

It's a common fact that vampires dislike crucifixes, holy water, garlic...

Really?

Bullshit, of course not, that's a modern lie.

But what they really dislike is marzipan.

This causes in them a very uneasy feeling up to a slight panic when they can't make up the source of it (depending of course the characters personality, somebody like Marius would not really bother with this smell)

But why is that so?
It is like the name suggests the blood of the dead ones. For vampires it causes a lethal poisoning and a very long and painful way of  suffer and hell. At first they feel no symptoms at all they only develop the feeling we humans know from a cold: headache, pain in the limbs, sore throat. Then it develops further with fever and coughing. The Deathblood slowly destroys the inner organs and dissolves them bit by bit, the lungs, the heart, the organs which formerly were their guts.

It causes inner bleeding, the infected vampires cough up the blood and the remains of what formerly were their organs. The symptoms growing worse and worse over the period of some few weeks.

And once it crosses the blood-brain-barrier it causes the death of a vampire within few minutes.

So what to do against this sickness? Vampire blood has healing powers and it can undo the damage the Deadblood cause, but it cannot heal from it. The only cure from it is the blood of the creator. The vampire by whose blood the infected one once was turned.

And what has this now to do with marzipan?
Well, it's the scent. When a vampires is poisoned they have a slight scent of almond. The poisoned one himself can't smell it but everybody around does and it's the very first sign of this poisoning. >And this scent causes a very uneasy feeling for other vampires, as being poisoned means their death especially when their creator is unknown or not alive anymore.