Prophylaxis
From LSWiki
[ Spell : ] Prophylaxis [ Level : ] Two [ Reversible : ] No [ Sphere : ] Healing and Protection [ Components : ] None [ Usage : ] cast prophylaxis [on <target>] [ Effect : ] The spell Prophylaxis blesses the recipient with a purifying essence that makes them more resistant to disease, with respect to both acquiring diseases and fighting off any they presently have or later acquire, for a considerable length of time. If a target is not supplied, it defaults to the caster.