According to the Shadowserver Foundation and the Conficker Working Group, nearly a million Conficker-infected computers disappeared on January 1, 2010.

"The drop continued the botnet's waning during the latter days of December," writes SecurityFocus' Robert Lemos. "On December 29, IP addresses showing signs of Conficker infections peaked at 6.5 million before dropping to 5.3 million at the start of the new year."

"Andre DiMino, director and founder of the Shadowserver Foundation, said the group did not have enough data yet to determine the cause of the drop," Lemos writes.

Click here to read the SecurityFocus story.