This alternative view on what a virus actually is deserves some serious research. According to this source, viruses are actually created in our own bodies. They are signals from one cell to another about a perceived threat to the body. According to this theory, these are communicable, resulting in illness in others.

Scientists, are you listening? Never mind the alleged source of this info. It looks like a concept deserving of further evaluation. Anyone want to take a go at proving/disproving this?