Occurrence: Worldwide.
Species affected: All.
Age affected: All.
Causes: Non-motile gram negative bacterium Salmonella pullorum.
Effects: Young birds have a pasted vent. White diarrhoea, huddling, lameness, somnolence (sleepiness), laboured breathing and blindness can occur. Mortality peaks at 7-10 days with up to 100% mortality and/or morbidity. Adults usually have subclinical disease, or a drop in egg production, fertility, or hatchability may occur. Occasionally see depression, anorexia, diarrhoea and dehydration.