Herd immunity doesn't mean "safety in numbers". It means insulation from transmission vectors because the rest of the herd is immune from diseases that might in

Herd immunity doesn't mean "safety in numbers". It means insulation from transmission vectors because the rest of the herd is immune from diseases that might infect you. An isolated OSX machine surrounded by Windows machines in a network is relatively isolated from virus transmission vectors. Then again, Jeff Goldblum was able to write a virus on his Mac that he used to infect the alien mothership, so maybe they're not so secure after all...