Virus Processing and Virus Scanning - the difference?

[Nathan Olson]

What is the difference between Virus Processing and Virus Scanning?
What does one include that the other does not?

from logfile:
Oct  x x:x:x vaccinex MailScanner[x]: Virus Processing completed at x bytes
per second
Oct  x x:x:x vaccinex MailScanner[x]: Virus Scanning completed at x bytes
per second

Thanks,
Nate
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