Final answer:
The four most costly foodborne bacteria pathogens are Salmonella, Listeria, Clostridium perfringens, and Campylobacter jejuni.
Step-by-step explanation:
The four most costly foodborne bacteria pathogens are Salmonella, Listeria, Clostridium perfringens (C. perfringens), and Campylobacter jejuni. These bacteria are recognized for causing significant diseases from food consumption. The Centers for Disease Control and Prevention (CDC) and regulatory agencies such as the Department of Agriculture and the Food and Drug Administration focus on these pathogens among others due to their impact on public health.