Fowl typhoid and pullorum disease are caused by two very closely related organisms of Salmonella enterica. Pullorum disease is usually symptomatic only in young birds. The mortality rate varies, but it can be as high as 100%. Fowl typhoid resembles pullorum disease in young birds, but it is also a serious concern in growing and adult poultry.

Signs of PT include:
White diarrhea
Pasted vent
Huddle together
Lameness
Difficulty breathing