Ferret Proliferative Colitis Study Guide

Overview and Clinical Importance

Proliferative colitis (also known as proliferative bowel disease or PBD) is an infectious bacterial enteropathy affecting domestic ferrets. This condition is caused by Lawsonia intracellularis, an obligate intracellular bacterium that also causes proliferative enteritis in swine and hamsters. Historically, the causative agent was believed to be a Campylobacter-like organism (ICLO), and older literature may reference Campylobacter or Desulfovibrio species; however, current evidence identifies L. intracellularis as the primary pathogen.

The disease is characterized by mucosal hyperplasia and thickening of the intestinal wall, particularly affecting the ileum and colon. This proliferation interferes with nutrient and water absorption, leading to the characteristic clinical signs of chronic diarrhea, weight loss, and potential rectal prolapse. While relatively uncommon in modern pet ferret populations due to improved husbandry practices, PBD remains an important differential diagnosis for young ferrets presenting with gastrointestinal disease.

Etiology and Pathogenesis

Causative Agent

Lawsonia intracellularis is the confirmed etiologic agent. Key microbiological characteristics include: a Gram-negative, non-spore-forming, microaerophilic curved rod; obligate intracellular pathogen requiring actively dividing eukaryotic cells for cultivation; inability to grow on standard cell-free culture media; and closely related to the organism causing proliferative enteritis in pigs and hamsters.