Worms attach themselves to the intestional lining and the tears in the lining can become infected. By the time the stools are foul there is an advanced intestional infection going on. When my birds were sick, the foul stools were a huge clue, the stools did not look normal either. They were thin, clear, green, bloody, all different colors. When the infection is extensive enough, the toxins from the ecoli or cocci, or whatever goes through the birds system causing sepsis and death will ensue unless antibiotics are given. It is rare that the bird by then will pull out of it. The parasites have weakened them so much by then it is just the downward death spiral. Here is a link:
http://msucares.com/poultry/diseases/disparas.htm
http://msucares.com/poultry/diseases/disparas.htm
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