Adults may be vectors of pathogens of diseases such as dysentery. Flies, most commonly Calliphoridae, have frequently been associated with disease transmission in humans and animals, as well as myiasis. Studies and research have linked "Calliphora" and "Lucilia" to vectors of causal agents of bacterial infections. These larvae, commonly seen on decaying bodies, feed on carrion while the adults can be necrophagous or vegetative. During the process of decay, microorganisms (e.g. "Mycobacterium") may be released through the body. Flies arrive at the scene and lay their eggs. The larvae begin eating and breaking down the corpse, simultaneously ingesting these organisms which is the first step of one transmission route.