Decrease in Threats?

In the last 30 days, I have experienced a extraordinary decrease in email 
threats being stopped at the edge and also being seen on our quarantine 
server. My first thought was something got in and disabled our security 
services, but upon investigation that is not the case. It looks like the 
quantity has indeed dropped, and I am trying to confirm it (only virus's, 
worms, etc.; not spam).

I've been trying to find any trending of threats seen worldwide, and the 
only one I have found is at f-secure. The chart seems to support what I'm 
seeing but I'm curious if others are seeing a decrease also. If indeed the 
threats are dropping off, is it due to the efforts undertaken to mitigate 
the WMF flaw?

Also if anyone knows of other sites that show historic trends, I'd 
appreciate being given the link. I see most antivirus sites will only give 
percentage breakdowns and not quantities seen.

Thanks You

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