Check manual page of symantec_av_updates
Symantec Anti Virus Update Status
This check will trigger a warning state if the antivirus updates are outdated.
The default level for Warning is 3 and for Critical 5 Days. The levels must be specified in seconds.
You just need to install the plugin symantec_av into the plugins directory of your agent.
One service will be created for each system will be created.