It's from the wiki.An antivirus sourced from a higher level Sentry will replace the antivirus sourced from a lower level Sentry that is installed in a Node.
Does higher level A/V eventually spread to all nodes?
If a higher level A/V recaptures a node that originally had a lower level A/V installed on it, the node now has the higher level A/V on it?
If you have two sentries of different level, should the higher level be in the front or in the back?