Related Clues:

• Venom, e.g.
• Purel target
• Idea's start
• Start, as of an idea
• Tiny bug
• 'Cootie'
• Harmful agent
• It may be what ails you
• From which disease comes
• Micro-organism causing disease
• Poison, venom
• A micro-organism causing disease
• Disease-causing bacterium
• Micro-organism that causes disease
• Small organism that spreads disease