I hope they are not refer to this:
From Alpha Centuari: The dominant animal life form of Planet is the mindworm, a small, horrid-looking parasitic creature about 10cm long. A single mindworm is a dangerous pest, able to burrow into a human brain and devour it, while the victim succumbs to violent delusions or dangerous fantasies, or lives out his deepest terrors. Many theories have been advanced to explain the psychoactive nature of these attacks, but none have been experimentally validated.
Far worse than a single worm, mindworms are known to form vast mobile colonies, called 'boils', which can overwhelm a military unit or even an entire base.
- wong chee tat :)
