If your house was infested with mice, the chances are that you would call a pest control firm to get rid of them.
Once they had done their work, you might go as far as to replace some of the furniture nibbled by the rodents but you probably wouldn't replace every single item they had touched.
Yet that was the approach taken by the New York Times when it cleaned house after its internal network was infested by a more modern nuisance - computer hackers.
Every device, be it a laptop or chunk of network hardware, known or thought to have been compromised by the Chinese hackers was thrown out and replaced with a shiny, and more importantly, clean machine.