I found this article useful for users of Linux operating system with internet.
According to this website the best security suite for Linux OS it's the ESET Antivirus and Antispyware.
This shields your Linux system against malware and keeps out cross-platform threats.
The experts tested most 24 security suites and 8 corporate security solutions.
The article is very interesting - not only a top of the software. It includes specific test data made with details.