You sure though?

What do you want? It should go without saying that I am absolutely sure of my own experience.

In probably 15 years total of running Linux I have not had a single problem with malware or viruses. Part of that time was also running Windows regularly and my Windows systems DID become infected with both malware and viruses occasionally, despite my best efforts. And you're not mentioning the fact that Linux runs on 63% of the server market and those systems are under constant attack.

Reports of Linux system infections are truly rare, and considering the nature of the user community would be widely and loudly reported if they were happening.

Do you have any experience in this matter? Have you had your own Linux installations infected, or are you a Windows user questioning what you're reading? (Perfectly reasonable if the 2nd one's the case.) Please fill us in on the details.