Vius Scan

I just decided to do a full system scan on a whim. I did this two days ago. There were 38 threats detected. If I just did a scan two days ago and have been running Bitdefender why are there threats on my computer? Shouldn't they have been caught as they were incoming? Further, why do I have to run a scan to find them? Isn’t Bitdefender always scanning my computer and removing them as I go?

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