24/09/2025
Pullorum Disease (Bacillary White Diarrhea)
Pullorum disease is a highly infectious bacterial disease of poultry, particularly young chicks and turkey poults, caused by Salmonella enterica subsp. enterica serovar Pullorum (commonly called Salmonella pullorum). It is a vertical and horizontal transmissible disease, characterized by high mortality in young birds, white diarrhea, and septicemia. Though it has been largely controlled in many developed countries through eradication programs, it still occurs in parts of Asia, Africa, and South America.
Etiology/cause
Causative Agent: Salmonella enterica subsp. enterica serovar Pullorum (S. pullorum).
Host Range
Primary hosts: Chickens and turkeys (most susceptible).
Other hosts: Pheasants, guinea fowl, ducks, peafowl, quail, and other wild birds (less common).
Transmission
Pullorum disease spreads by:
1. Vertical Transmission (Most Important):
Infected breeder hens can transmit the bacteria through the egg (transovarian transmission).
Chicks hatch already infected, making control difficult.
2. Horizontal Transmission:
-Through ingestion or inhalation of contaminated feed, water, litter, or equipment.
-Contact with infected f***s or secretions.
-Spread by caretakers, rodents, insects, or contaminated hatcheries.
Incubation Period
-Typically 4–6 days in young chicks.
-May be longer in adult carriers where infection remains latent.
Clinical Signs
-The severity depends on the age of the bird:
-In Chicks and Young Birds (Acute Form)
-Age affected: 1–10 days old (most common).
Symptoms:
-Depression, weakness, huddling, and ruffled feathers.
-Poor appetite and slow growth.
-White, pasty diarrhea sticking to the vent.
Treatment
-Antibiotic such as tetracycline
prevention and control
-vaccination
-good hygiene practice
-restrict movement of people to the farm