Antivirus- A Corrective Control?

[kartik.netsec () gmail com]

Hi, I have a confusion whether Antivirus is a Preventive control or a Corrective control? I am preparing for CISSP and 
somewhere I have read that AV is a corrective control. I somehow disagree with this point. 

I believe AV can only be a corrctive control if the machine (without AV) gets infected and then AV software is 
installed on it.

On the other hand, a machine already having an AV installed should be taken as a Preventive control.

Any inputs please?

Thanks,
Kartik

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