Understanding and Managing Avian Colibacillosis

Avian colibacillosis is an infectious disease in poultry caused by Escherichia coli (E. coli), a gram-negative, non-acid-fast, non-spore-forming bacteria. While E. coli is commonly found in the intestinal tracts of birds, it can become pathogenic under certain conditions. Colibacillosis is a leading cause of illness and death in poultry across all age groups, resulting in significant economic losses for the poultry industry. The disease is characterized by reduced productivity, increased mortality rates, higher veterinary costs and economic loss of poultry farmer. E. coli can act as either a primary pathogen or a secondary invader, particularly in birds debilitated by other diseases or stressors. Common predisposing factors include viral infections (e.g., infectious bursal disease, Newcastle disease, infectious bronchitis), mycoplasmosis, coccidiosis, nutritional deficiencies, poor husbandry practices, and stressors like overcrowding. The disease manifests in various forms, including yolk sac infections, omphalitis (navel and yolk sac infection), respiratory tract infections, swollen head syndrome, septicemia, polyserositis (inflammation of serous membranes), coligranuloma (granulomatous infection), enteritis (intestinal inflammation), cellulitis (skin infection), and salpingitis (oviduct inflammation). These diverse clinical presentations make it challenging for diagnosis and control. E. coli thrives in both aerobic and anaerobic environments, allowing it to spread rapidly in poor management condition. Effective prevention and control require maintaining proper hygiene, improving biosecurity, avoid overcrowding, ensuring adequate nutrition, and managing predisposing diseases.