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Your don't worry about infections is off the mark for a couple of reasons. First of all there are worms and malware attacks that target linux machines. See
https://help.ubuntu.com/community/Linuxvirus
http://www.sophos.com/medialibrary/Gated%20Assets/white%20papers/linux.pdf

Second, as Apple is finding out, a larger market share will make linux a bigger target for the blackhat community. ClamAV and Sophos targeted the linux community for a reason.
Mark