The only caveat to using ClamWin is that it does not offer a real-time scanner - which is not an issue for a portable version. This is my go-to portable virus scanning software.
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Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website jackwallen.com.