This spell keeps a disease already infecting the subject from harming him for that day.
Book of Vile Darkness 3.5
By Monte Cook
Level: Cleric 1, Druid 1, Sorcerer/Wizard 1
Components: V, S, M
Casting Time: 1 action
Target: One creature
Duration: 24 hours
Saving Throw: Fortitude negates (harmless)
Spell Resistance: Yes (harmless)
The disease is in no way cured, and the subject cannot make a save to throw off the disease. Casters who intend to cast spells with a disease component find this spell particularly useful.
Material Component: A drop of bile.