SafeMark Practice Test 2026 - Free Practice Questions and Study Guide

Fecal-oral transmission through foods handled by people is a hallmark of highly contagious pathogens that can spread with minimal contamination. Shigella species are extremely infectious, requiring only a small number of organisms to cause illness. The bacteria spread readily when an infected person handles food and does not wash hands properly, allowing contamination of a wide range of ready-to-eat foods. This makes Shigella a common cause of outbreaks linked to foods touched by multiple handlers in settings like restaurants and institutions.

In contrast, Campylobacter jejuni is most often linked to undercooked poultry and unpasteurized dairy; Vibrio is typically associated with contaminated seafood and water; Listeria monocytogenes can contaminate various ready-to-eat foods but its outbreaks and transmission patterns center more on specific high-risk foods and settings. The widespread, hands-on contamination pattern is especially characteristic of Shigella, which is why it best fits the scenario.