Foal-heat Diarrhea: occurs 4-14 days after birth, self-limiting, BAR foals, no fever present.
Clostridium perfringens and
Clostridium difficile): Most common bacterial cause of diarrhea in foals. C. perfringes affects foals <7 days; Type A most common. C. difficile causes hemorrhagic diarrhea and death in all foal age groups.
Salmonella: Second most common cause of diarrhea in foals. Usually acquired from dam.