>>Could that be due to a newer version of the .DAT file for NAV as opposed to McAfee?
>
>It's possible, although to the best of my knowledge both programs had up-to-date virus definition files at the time. This was circa November of 1999. Both SARC (NAV) and McAfee show Ethan.A as having been discovered in January 1999, so one would think that even a .DAT file several months old should have included it by November.

Yes, I would think that the .DAT files would have that information. I still wonder if it was an options setting or something like that.