Active Bot-Infected Computers per Day

An active bot-infected computer is one that carries out at least one attack per day. This does not have to be continuous; rather, a single computer can be active on a number of different days. Between January 1 and June 30, 2007, an average of 52,771 active bot-infected computers per day were observed, a 17% decrease from the previous reporting period.

Source: Symantec Internet Security Threat Report, Vol. XII