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(CNN) -- In the peak of cold and flu season, many Americans may want to hide at their desks to avoid those hacking and sneezing co-workers. But health experts say that could be the very place that makes them sick.

A study by the University of Arizona in 2002 found the typical worker's desk has hundreds of times more bacteria per square inch than an office toilet seat. If that's not disturbing enough, desks, phones and other private surfaces are also prime habitats for the viruses that cause colds and flu.