I attended the release announcement webinar for the newest version of the Security Essentials app ("easy button") and the presenter listed a few antivirus vendors with which the app can integrate but have not been able to locate that information since that time. We are considering a switch in antivirus at this time and integration with SE could be a significant influence. Any information you can provide will be appreciated!
I found the answer to my question after the app was installed, on the page https://[instance-name]/en-US/app/Splunk_Security_Essentials/data_source?datasource=Anti-Virus. Apparently, any antivirus source that feeds text data can be integrated, though the groundwork has been done for some of the most common products.