Now, scientists say that viruses carried by these worms may be one reason they cause such severe illness. In a recent study, published in September in the journal Nature Microbiology, the ...

U.K.-based Sophos spotted more than 10,700 new viruses, worms, and Trojan horses during the 12-month span of November 2003, to November 2004, a 51.8 percent increase over the same period a year ago.

Cabir was a worm that spread via Bluetooth, and while it wasn't particularly harmful, it demonstrated the potential for mobile phone viruses to propagate and infect other devices. Discovered by ...