Anyone uses anti virus program? [View all]

Some years back I had Intego and then I uninstalled it because it appeared to interfere with the router for my spouse's laptop.

Now Comcast modem has a built it WiFi and I am getting emails - bombarded, really - from Intego about their "Washing Machine."

Is it worth it? Having used a Mac since 1987, I always felt secure that Mac was immune to viruses but the reason, or one of the reasons, was that not enough were using a Mac to be worth it for someone to develop a virus. Now, am not sure.

What do you guys say?