Bl....day hell, that lasted some time! Vitus ( all alloy, or carbon+ alloy) were great frames for a season, but It was well known that they weren't frames to keep too long. Pro teams that used them had a monthly turn over it in some cases. The same frames appeared as Peugeot, and were used by a few teams including ANC. Standard practice was to drop the forks out virtually every day to check for cracks in the alloy steerer. However, they were very light by the standards of the day, and much sought after by climbers in particular.
Don't forget that Kelly won Roubaix on Vitus frames, so they weren't that fragile!
To be fair, it's lasted well, most frames of any material don't go on that long unless they are wrapped up and preserved as collectors pieces.
Virus now is a brand used by Chain Reaction, nothing as far as I know to do with the old bonded frames.