That is a good question. I know for instance that in 2010, in the U.S., there was a salmonella epidemic in eggs. Further to the incident, the media focused a lot on the fact that it must have occurred because the chickens were raised in cages. In fact, we know that there is a far higher risk of illness among chickens that are cage bred. Afterwards, the media really insisted on the fact that perhaps they should be free-roaming for the purposes of better food safety.
Does that answer your question?