How did the virus start on the walking dead?

I really want to know..

Does it say in the comics

Do they release it?How did the virus start on the walking dead?
The best article I can find on it:



http://www.comicvine.com/news/off-my-min鈥?/a>



nobody knows for sure, some people don't want to know cause they think that makes the story and keeps it going. Others have several different theory.



None are concrete

jane iredale