Governments have begun legislating against cage egg production and a growing number of major food retailers, restaurant chains, and foodservice providers worldwide are switching to cage-free eggs. Extensive scientific evidence strongly suggests this trend will improve food safety. All fifteen scientific studies published in the last five years comparing Salmonella contamination between caged and cage-free operations found that those confining hens in cages had higher rates of Salmonella, a leading cause of food poisoning worldwide. This has led prominent consumer advocacy organizations, such as the Center for Food Safety, to oppose the use of cages to confine egg-laying hens.
Humane Society International, "An HSI Report: Food Safety and Cage Egg Production" (2010). HSI Reports: Farm Animal Protection. Paper 3.