What percentage of Linux machines would you say are infected? :-D

I run Kubuntu on my work laptop (my business reason is that I need Eclipse, which is happiest in Linux). I run ten different Linux devices at home.

All squeaky-clean, and not just because Linux is a better OS. Social engineering is still a risk, but I've received IT security training, and have passed the good advice on to my wife, who is careful and aware.