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Unless your AS400 is running software which can be infected, it is not likely that there is any threat posed by Nimda. Some companies have had virus issues with infected files getting onto AS400 systems in the PC Folders (i.e., the special areas set up to handle PC formatted files). If you are using this feature (I might have forgotten the exact name), you should scan the files in it using an up-to-date antivirus scanner.
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