There is scour, ill thrift and high mortality during the first 4 weeks post-weaning. All post-mortemed pigs had the same gross lesions, as the one seen in the picture. What is the most likely cause of this lesion?

• Salmonellosis (Salmonella typhimurium)
• Colibacillosis (Escherichia coli)
• Ileitis (Lawsonia intracellularis)