Reply #15: A Mac system that passes these infections on to a windows computer [View All]

[hobbit709]

is then a carrier. Just because the virus didn't infect a Mac doesn't mean the Mac user can't forward the infected file to someone else.
My beef with Mac users is their smug superiority attitude that doesn't bother with security because "Macs don't get viruses"
That is fine up to the point where the infected email is sent on to someone else.

The most common cause of infections is the ID ten T error. I've had ONE virus in the last five years or longer and that was because I trusted a disk someone gave me.