Which organism has a 100% prevalence in poultry according to the material?

• A. Campylobacter jejuni
• B. Salmonella enteritidis
• C. Listeria monocytogenes
• D. Norovirus

Answer: (A)

In poultry, prevalence refers to how widespread a pathogen is across birds or flocks. The material states that Campylobacter jejuni has 100% prevalence in poultry, meaning every tested bird or flock carries it. This reflects Campylobacter’s role as a ubiquitous gut colonizer in poultry, especially in the intestinal tract and ceca, which leads to widespread contamination potential during processing. Because it’s so commonly present, control efforts focus on preventing colonization and reducing contamination rather than trying to eradicate it completely from a flock.

Salmonella enteritidis is a major concern in poultry and eggs, but its presence is not universal in all flocks. Listeria monocytogenes can be found in poultry, but not with the universal prevalence implied by 100%. Norovirus is a common cause of gastroenteritis in humans and, while important in foodborne illness, is not typically described as a universal poultry colonizer. Therefore, Campylobacter jejuni best fits the notion of 100% prevalence in poultry as given.