Which Salmonella serotype is most commonly associated with shell eggs?

• A. Salmonella Newport
• B. Salmonella Enteritidis
• C. Salmonella Kentucky
• D. Salmonella Typhi

Answer: (B)

Shell eggs are most often linked to Salmonella Enteritidis because this serotype readily colonizes the hen’s reproductive tract, allowing the developing egg to become contaminated internally before the shell forms. That means an egg can be contaminated inside even if the shell looks normal, making Enteritidis the primary driver of egg-related illnesses. Other serotypes, such as Typhi, are human-restricted and not typically associated with eggs, while Newport and Kentucky are more commonly linked to other foods like poultry, dairy, beef, or produce. To reduce risk, cook eggs thoroughly (until both whites and yolk are firm), use pasteurized eggs for dishes that require raw or lightly cooked eggs, and keep eggs refrigerated.