Les editeurs les plus rapides seraient :

Voici un article assez édifiant ( Source : trouvé sur le site de
Kaspsersky ) et qui établi un hit parade des éditeurs les plus
réactifs à mettre à jour leur bases anti-virales :
http://www.kaspersky.com/news.html?id6126048

MCafee et Symantec semblent être parmi les plus lents : compte tenu de
la part de marché énorme que ces deux éditeurs trustent et de la
mauvaise ou non formation de leur utilisateurs, ceci explique
peut-être pourquoi tant d'infections continuent à se développer

==

Virus threats on the Internet are steadily increasing. Given this, the
speed at which antivirus developers react to new viruses is a crucial
factor in the effectiveness of any information security system. There
have been several massive virus attacks since the start of 2004, each
more destructive than any seen before.

In connection with this, a well-known research group from Magdeburg
University, AV-Test.org conducted independent research to establish
the reaction time of antivirus developers to new malicious code. This
research was designed to discover the average time taken to release an
anti-virus database update from the moment a new virus is first
detected. The recent notorious viruses, Dumaru.y, Mydoom.a, Bagle.a
and Bagle.b, which are all detected using heuristics, were used as
controls.

This analysis is more objective than traditional comparative testing
carried out by IT publications and research centres. Such tests use
collections of older viruses, detected over a month prior to the start
of testing, to determine the efficacy of antivirus products. This
means that the most important factor in the quality of an anti-virus
solution is overlooked: reaction time. It is this specific feature
which determines the reliability of protection against new threats.
The research carried out by the group from Magdeburg University
clearly illustrates the actual quality of antivirus systems, which in
turn determines the level of information security as a whole.

For maximum accuracy in analysing the speed at which antivirus
database updates are released, the researchers used dedicated script
programs. These scanned the developers' servers every 5 minutes for
new updates. The mean results of all data received showed that
Kaspersky Labs was the quickest in responding to new virus threats.

The results of the experiment ranked antivirus developers as follows:

1. Kaspersky Labs
2. Bitdefender
3. Virusbuster
4. F-Secure
5. F-Prot RAV
6. AntiVir
7. Quickheal
8. InoculateIT-CA
9. IkarusšAVG
10. Avast
11. Sophos
12. Dr. Web
13. Trend Micro
14. Norman
15. Command
16. Panda
17. Esafe
18. A2
19. McAfee
20. Symantec
21. InoculateIT-VET