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A contamination can occur when classified information is found on a computer or information system that is not accredited for classified information. Contamination of a computer can also occur when malware infiltrates it.
Contamination may have occurred in an information system when classified information is found on a computer system which is not supposed to be there. This may have happened:
Contamination can also occur through a computer virus or other form of malware. An anti-virus tool should be enabled to remove an active virus from a system.