Via Marshall Brain’s, 
‘Keyboards are dirtier than toilets’, an article from the Australian ABC.
“When someone is infected with a cold or flu bug, the surfaces they touch during the day become germ transfer points because some cold and flu viruses can survive on surfaces for up to 72 hours – an office can become an incubator.”
Now it’s a good time to print out a couple of those biohazard icons and glue them on your laptops.