Psi 2000 Virus

A water based disease organism originally found on the planet Psi 2000 in 2266.

This virus infected members of the Federation science team stationed on that planet, causing suppression of their inhibitions, and ultimately their deaths.

Transmitted through human perspiration, the virus later infected members of the Enterprise crew, resulting in the near destruction of the starship when infected crew member Kevin Riley disabled the ship's engines while it was in orbit around the disintegrating planet.