Virus Batteries being used for the future!

In the world changing book on page 113 there is an article called "Viruses Making Batteries". Here is a link talking more about the topic. It's so bizzare to see a virus being used as energy. Once you have a virus you can never get rid of it. It can only be treated. So lets say some crazy accident happens and the battery leaked like they normally do when you have them in for a while. Would that virus substance be hazardous to you or no? Seems like it would if you were to consume it. Also a virus needs a host, so what host would it be inside the batteries?