Deleting virus-infected files from Time Machine backup

Whatever application you used for that determination should be ignored and permanently deleted from your system. It is worthless and dangerous.

Never, never, never, delete any files from a Time Machine Backup.

Just curious, what application are you using? What files are identified as containing a virus?

My previous advice remains valid. Do not mess with your backup because of those warnings.

Read: Effective defenses against malware and other threats for additional details.

How did you do the check? Uninstall the antivirus app.