Erysipelothrix infections in humans characteristically produce pathology at which site?

• A. Central nervous system pathology
• B. Pathology at the point of entrance
• C. Pathology in the lower respiratory tract
• D. The formation of abscesses in visceral organs

Answer: (B)

The key idea is that Erysipelothrix infections in humans typically cause disease right at the site where the bacteria first enter the body. This occurs through breaks in the skin during occupational exposure to fish, meat, or handling animal products. The classic presentation is an erysipeloid lesion: red, swollen, painful areas usually on the hands or fingers where inoculation happened. Because the infection starts at the entry point and remains localized there, the pathology is best described as occurring at the point of entrance. While systemic involvement can occur in rare cases, the hallmark feature is the localized skin/soft-tissue reaction at the entry site.