Salmonellosis annually causes, per CDC estimation, about 1.2 million illnesses, 23,000 hospitalizations, and 450 deaths in the United States every year.[1]
The shell of the egg may be contaminated with Salmonella by feces or environment, or its interior (yolk) may be contaminated by penetration of the bacteria through the porous shell or from a hen whose infected ovaries contaminate the egg during egg formation.[2][3]
Salmonella is found in 8% of the chicken parts tested by the USDA and 25% of ground chicken.[4] Antibiotic resistance has developed in some strains of salmonella.[4]
^Gantois, Inne; Richard Ducatelle; Frank Pasmans; Freddy Haesebrouck; Richard Gast; Tom J. Humphrey; Filip Van Immerseel (July 2009). "Mechanisms of egg contamination by Salmonella Enteritidis". FEMS Microbiology Reviews. 33 (4): 718–738. doi:10.1111/j.1574-6976.2008.00161.x. PMID 19207743. Eggs can be contaminated on the outer shell surface and internally. Internal contamination can be the result of penetration through the eggshell or by direct contamination of egg contents before oviposition, originating from infection of the reproductive organs. Once inside the egg, the bacteria need to cope with antimicrobial factors in the albumen and vitelline membrane before migration to the yolk can occur
^Humphrey, T. J. (January 1994). "Contamination of egg shell and contents with Salmonella enteritidis: a review". International Journal of Food Microbiology. 21 (1–2): 31–40. doi:10.1016/0168-1605(94)90197-X. PMID 8155476. Salmonella enteritidis can contaminate the contents of clean, intact shell eggs as a result of infections of the reproductive tissue of laying hens. The principal site of infection appears to be the upper oviduct. In egg contents, the most important contamination sites are the outside of the vitelline membrane or the albumen surrounding it. In fresh eggs, only a few salmonellae are present. As albumen is an iron-restricted environment, growth only occurs with storage-related changes to vitelline membrane permeability, which allows salmonellae to invade yolk contents.
^ abSimon, Bernice Yeung,Michael Grabell,Irena Hwang,Mollie. "America's Food Safety System Failed to Stop a Salmonella Epidemic. It's Still Making People Sick". ProPublica. Retrieved 2021-11-03.{{cite web}}: CS1 maint: multiple names: authors list (link)
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