Gastrointestinal Impaction and Necrotic Enteritis in a Backyard Chicken

Area of Science:

• Avian Pathology
• Veterinary Microbiology
• Poultry Disease Diagnostics

Background:

• Backyard chickens are increasingly popular, raising the need for understanding their specific health challenges.
• Gastrointestinal disorders and necrotic enteritis are significant concerns in poultry, impacting flock health and productivity.
• Clostridium perfringens is a known cause of necrotic enteritis in poultry, but specific strains and concurrent conditions require further investigation.

Purpose of the Study:

• To diagnose and characterize a case of gastrointestinal impaction and necrotic enteritis in a backyard chicken.
• To identify the causative agent, specifically the type and virulence factors of Clostridium perfringens involved.
• To report a novel concurrent presentation of gastrointestinal impaction and necrotic enteritis in backyard chickens, and the association with Clostridium perfringens type F.

Main Methods:

• Postmortem examination and diagnostic workup of a backyard chicken exhibiting chronic weight loss and diarrhea.
• Gross and histopathological evaluation of the gastrointestinal tract.
• Bacteriological culture, Gram staining, immunohistochemistry, and PCR toxinotyping for Clostridium perfringens identification and characterization.

Main Results:

• Gross findings revealed marked distention and impaction of the proventriculus, gizzard, and duodenum with plant material, grain, and litter.
• Histopathology showed segmental transmural necrosis of the intestinal wall, villi epithelial sloughing, and fibrino-hemorrhagic exudate.
• Clostridium perfringens type F, possessing alpha toxin (cpa) and enterotoxin (cpe) genes, was identified as the causative agent, likely exacerbated by diet.

Conclusions:

• This case represents the first documented instance of concurrent gastrointestinal impaction and necrotic enteritis in a backyard chicken.
• The identification of Clostridium perfringens type F in this context is a novel finding, as this type has not previously been associated with necrotic enteritis in chickens.
• Dietary factors, including fibrous forage and fermentable grains, likely contributed to the overgrowth of Clostridium perfringens and the development of these pathological conditions.