Do I need antivirus for Linux?

Hi guys. I use Ubuntu 2 years now and I never had a problem with virus, malware, trojans and stuff. I used to think that there's no need to have antivirus for Linux but I realized there are several antivirus programs for Linux. So, do I need to install antivirus? I don't use Windows at all. Are there any chances I get a virus in Ubuntu? Thanks for your answers.
