In game all slows appear to have DR counters. Going by the Spdat they should be MR based and unable to be cured (dispel only).
Quote:
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Casters of slow spells recently given a disease component (such as Shiftless Deeds and Turgur's Insects) should no longer attract undue attention to themselves.
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http://www.tski.co.jp/baldio/patch/20020424.html
Also pet healing spells should not cure disease.
Quote:
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Pet healing spells now have a Cure Disease effect.
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http://www.tski.co.jp/baldio/patch/20020409.html