Viruses are virtually contagious. I'm quite convinced that when you sneeze on your computer, your germs are wireless transmitted through the air to far reaching areas of the world.
Just pay attention, you'll see...someone tweets about a fever and WHAMMO, now your kiddo has it. Someone blogs about being run down with a cold and SHAZAM, you're laid up in bed with a box of Kleenex and a bag of Luden's.
Oops, sorry about that sneeze I just sent to you over the Interwebs. You, um, might wanna wash your hands now.
Or take some Vitamin C.
Stock up on Kleenex.
Maybe even get some ingredients for chicken noodle soup.
You're gonna need it.
Being that you just read this post and all.
Consider yourself officially inoculated.