Which of the following is NOT among the four most costly foodborne pathogens in terms of illness burden?

• A. Salmonella
• B. Escherichia coli
• C. Listeria monocytogenes
• D. Staphylococcus aureus

Answer: (D)

The main idea is that illness burden looks at the overall impact of a pathogen, not just how often it occurs. Burden combines how many people get sick with how severe the illness is, how often it leads to hospitalizations or long-term problems, and even deaths. So a pathogen that causes many illnesses but mild symptoms can still contribute less to burden than one that causes fewer cases but more severe outcomes.

Among foodborne pathogens, Salmonella, pathogenic Escherichia coli, and Listeria monocytogenes tend to drive a large portion of the illness burden because they can cause significant disease, dehydration, hospitalizations, and even serious complications in vulnerable groups. Staphylococcus aureus, while it is a common cause of food poisoning, usually triggers rapid, toxin-mediated symptoms that resolve quickly and rarely lead to hospitalization or long-term effects. That combination means it does not rank among the four most burdensome pathogens in terms of illness burden.