Russian security company Dr. Web has reported that variations of the Flashback trojan have infected more than 500,000 Macs around the world. That number was later raised to 600,000, with 274 bots were even found in Cupertino, Calif., ironically where Apple's headquarters are located.
57 percent of the infected Macs are located in the U.S. and 20 percent are in Canada.
Security firm F-Secure has instructions on how to detect and delete the Flashback trojan from your system.