I understand.
However if these messages are on 100-200 machines that will mean it is a outbreak.
Left alone is something that cannot be configured. However it is something when Antivirus was not able to take any action against it. Due to permission ( file being on remote machine or on flash disk or in a diffrent users profile, threat installed as server or hooked into winlogon etc etc etc. )
What you can do is make sure these clients have latest virus definitions and then you can initiate a full scan from the sepm server on these clients.
If that takes care of it fine. if not then you should visit that machine to clean it and patch it latest windows security patches.