Occurrence: Worldwide. Species affected: All. Age affected: All.

Causes: Gram negative bacteria- Escherichia coli. It is the most common bacterial pathogen of poultry, and the second most common of all poultry pathogens.

Effects: Low performance in older birds, or high mortality in younger birds. High embryonic mortality, respiratory distress and enteritis can be evident.

This disease has a number of names because it causes gra...