Virus under Linux and security

Linux is known as a secure system. In fact, everything depends on the circumstances. Absolute security is only available for a machine that is connected to any network and physically inaccessible ...well lots of people asking me Is linux totally virus free ? or Do Linux require virus protection.. but there is some vulnerability present. 

Viruses under Linux
In 17 years, only a few reports of viruses that can affect network Linux have been reported with no virus spread.This relative immunity of GNU / Linux viruses is explained by the architecture of the operating system functional layers can not interact with each other only by very strict rules and by the existence of a system of files and users own architecture for all systems UNIX .Viruses encountered in everyday life including Windows are without any effect on Linux, either via email or your web browser.

There are viruses, worms and trojans (called malware) on Unix , although very little. Some malware (trojan-type) are very advanced. We call it a rootkit. They are rarely used and very little available. The majority are used as tools to test security by professionals, ie not to infect anyone, anywhere any how, but for test, audit, or contest.

• Your mail client on GNU / Linux, whatever it is, will not be susceptible to viruses that you may encounter in your mailbox.
• The GNU / Linux system is not sensitive either.
• These viruses will not be active at home.
• Unless you pass the infected attachment they can not be transmitted to your contacts by your machine their spread is stopped at home.

Regarding antivirus, Clam AntiVirus is it seems the better.It is very active and its database is updated at least once a day . This scanner free anti-virus running on Linux.Others exist, often specialize in mail servers, such as Kaspersky, more ...

It is rather a solution for heterogeneous environments or the mail server is GNU / Linux and Windows clients. These are both less secure and more victims of attacks, it may entrust the task of anti-virus server, and save the resources of the client under another OS than Linux.
For rootkits read this guide Rootkits danger and prevention ,also you can use chkrootkit & rkhunter both free, open source... and very effective.

So in the case of home computers (network) under the GNU / Linux, you say that you are now much more quiet, and the worries of malware disappears almost completely (the almost. . zero risk does not exist, at least not for computers). So of course the solutions are even more secure.