Rather than using the in built SCCM’s reports, I run a customized query to return Anti Virus detection.
SELECT v_R_System.Name0 as Name,Username,DetectionID,DetectionTime,ThreatName,Path,CleaningAction,ActionSuccess
Inner Join v_R_System
WHERE DetectionTime >= DATEADD(DAY,-%days%, GETDATE())
Edit the days value depending on how far back you want to go. I like to run this weekly and in my case, it would be -7.
You can use this if you build your own report in Reporting Services or if you are that way inclined, wrap it in Powershell to send an HTML email.
You can download and install the SQL Powershell module on a non sql server by following the instructions here http://guidestomicrosoft.com/2015/01/13/install-sql-server-powershell-module-sqlps/