Worst detection - Severity 0 Viral . What is it ?

Hello .

Please view attachment with logs from SEPM and help me to ansver some question

1) What is viral ? I know that Severity 0 is the worst threat, but I coulnd't find specific information about viral itself. What kind of threat  is it?

2) For what "Creation time " stands for? Is it a time of conecting servert to SEPM?

3) Last virus time is from 05.2015 but when I generating reports I don't heve any viruses on that time . What kind of reports will show this ?

4) On the home panel in SEPM I dont have information about infected or detected threat , even if I  change time for 365 days. Please expalin me what happen. Why console reporting last time virus but not provide inforation about it ?

5) Should I be worry about this ? :)

Thank you in advance