TAKEN FROM THE SOUL EATER WIKI:

"The Black Blood, invented and developed by Medusa, the witch, sister of Arachne, was part of an experiment to create a Kishin, through Crona, the experiment's subject.

The Black Blood's abilities include hyper-densification, and a speculated infectious property."

http://souleater.wikia.com/wiki/Black_Blood

SO WHAT DOES THIS MEAN FOR KC? Something REALLY VAGUE and FULL OF PLOTHOLES because I got a D in Biology.

So Medusa too the Black Blood from Maka Albarn. She then spent a month or so developing a new type of Blood that would adapt to KCers and their special abilities. Initially the symptoms start off looking like a flu, until you go batshit and start trying to kill everyone. With Black Blood comes super strength, durability and speed and regeneration. Black Blood can be spread through direct contact through the blood or...being bitten. Uh.

So far there is no way to remove the Blood, and people can only learn to live with it. But Medusa controls the insanity so. Fuck y'all.

LIST OF INFECTEES:

• Lavi
• Yoko Ritona
• Vera
• Hyde
• Ling/Greed idk who
• Maka
• Squaol
• TOKI
• Ichigo
• So many people are infected now I can't remember
• but i'll try
• Rolo
• Lelouch
• Makoto
• Saiko
• Hikaru
• SHIRLEY
• Badou
• everyone else idk
• oh yeah Fai

People who were infected but rejected the blood:

• Kanda
• Rinali
• Gokudera
• THERE WAS SOMEONE ELSE whatev man

BLACK BLOOD AND YOU!

1. How do I know my friend is infected with black blood?
   1. They look like this:
      1. 
   2. They start acting drunk like it's St. Patty's
   3. They try to kill you
   4. They become British
   5. They bleed BLACK STUFF
   6. They try to put said black stuff in you
   7. They're hella strong
2. What do I do if my friend is infected with black blood?

          RUN BITCH, RUUUUUUN!