I've been reading a paper about the Malicious-Software Removal Tool (MSRT, and I hyphenate it to prevent it being read as the Malicious software-removal tool), it's entitled, MSRT progress made, trends observed. If your interested in what the tool does, or in the statistics it makes fascinating reading.
Here are some points from its summary with a few comments of my own.
I find the last one is interesting - 600,000 computers which had never been infected were cleaned, bringing the total to 5.7 million, so 5.1 had been cleaned previously. 150,000 of the 5.1M were re-infected - about 3%, compared with 600,000 out of 200M previously clean - an infection rate of about 0.3%. I guess this isn't surprising. Of people infected most take steps to avoid re-infection; the ones who don't change are doing the things that make them likely to get re-infected, some will get re-infected after a month, some after 2, some after 3 and so on What we don't know is how many are clean through protection and how many through lack of exposure.
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