During the current reporting period, Trojans made up 71% of the volume of the top 50 potential malicious code infections -- a slight decrease from 73% in the first half of 2007 but still more than the 60% in the same period of 2006. It is interesting to note that, while the volume of Trojans in the top 50 decreased only slightly since the first half of the year, the number of distinct Trojans in the top 50 decreased from 22 in the first half of the year to 16 in the last six months of 2007.
Source: Symantec Internet Security Threat Report, Vol. XIII
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