If your character's powers involves disease and/or microlife, you must consider a number of factors.

How does your character infect others?

Does your character generate one type of disease or microlife?

What are the effects of your character's power on another character? For example, if your character can infect another character with Typhoid, what are the symptoms of that disease?

Can your character's infection be cured by normal medical means?

Can your character infect him or herself?

What is the rate of damage or effect of the infection?

How does this compare with Healing factors or Alien physiology?

How can the ailment or affliction be cured? Keep in mind that a character who would disfigure or kill other characters simply by walking by them would be problematic in roleplay situations.

Example Characters: Pestilence, Infectia