Flu season has always made people a little more wary of handshakes and shared items, but the global COVID-19 health pandemic has elevated that fear even further. Doorknobs, desks, and public areas become suspects, even within one’s own home. But how long can viruses live on these surfaces? Can a virus survive long enough to pose a threat to your health? The answer depends on so many variables that it’s impossible to give exact answers. But we know enough to give general guidelines, and the answers might surprise you.