I haven't tried the warthin-starry on frozen slides, but I use the Steiner method distributed by Sigma as the "modified silver stain".  Personally I think this is the best stain out there for helicobacter and the Pathologists that I work for would not allow me to use anything else.  Most everyone I know uses the Wright stain for helicobacter and I really don't see how they get by with that.  I work in a small hospital, but we do a very large amount of gastric biopsies which are all required to be stained for helicobacter and we get a lot of positive results that I feel would be missed using the Wright stain.

If anyone has any comments on this stain, I would love to hear them.

Thanks,
   Gwendolyn