Compare the results on the VGREP database as published on the Virus Bulletin website.
This site will be updated some days after the new vgrep database is present.
At present the database contains over 3.5 million names. The exact numbers are listed below.
| Virus descriptions | : | 4435127 |
|---|---|---|
| Samples tested | : | 1349145 |
| Antivirus Manufacturers | : | 14 |

Details can be seen on the overview page.
These results seem to indicate there are a lot of samples out there that are caught by only 1 scanner while the rest of them could not care less. The comparison is extensive but done somewhat infrequently. It's only usage is to compare names in use between the various malware scanners.
The results tend to be a bit old. The VGREP information is published once a month on avarage. Then it takes some days to become public. And finally it takes some more days before they are loaded in this database.