Curious

I have had Bitdefender for 6 months now. Since then, I have only found one threat on my pc and that was when I first installed it. Now I am wondering is Bitdefender that good or is it missing viruses during the scans? My pc seems to run fine so I am by no means complaining. I am just curious because when I had Zone Alarm, I would find viruses/Trojans during scans periodically. Anyone have any thoughts?

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