" The Coroner had cleaned the body so well that there were no visible infections, but the shape of the wounds was enough if you knew what you were looking for: a series of wounds similar to the others, but irregular and distorted as if they’d been stretched out of shape. Just like a bedsore, but smaller. There were only a few ways that kind of thing would happen to an ordinary wound, and only one of them would result in tissue gas. Somehow, by accident or by design, these wounds had been infected with human waste. "

― Dan Wells , Mr. Monster (John Cleaver, #2)