Cackle fever

From NWNWiki

Initial save DC: 16
Subsequent save DC: 16
Initial ability damage: 1d6 wisdom
Secondary ability damage: none
Incubation period: 1 hour
Type: extraordinary effect, disease

Cackle fever is resisted upon contraction if the target makes a successful initial fortitude saving throw. After the incubation period, subsequent fortitude saves are attempted to resist the ability damage. Two successful subsequent saves in a row will remove the disease (but not the side-effects).