Read my previous post carefully in this thread. I have my own source of malware samples and they were not collected from MDL and I tested a lot more than 50 samples. I test around 50 samples _each day_. So the number is probably around 500-1000 0-day samples, which gives you an idea of how effective an AV is. In fact, I can't even download stuff from MDL due to Clear Cloud DNS which blocks every single link posted on that site.