The causes of IBD are not always clear but may include poor diet, food allergies and sensitivities, parasitic infections, or adverse drug reactions.

鸡传染性法氏囊病的原因并不总是很清楚，但可能包括不良的饮食习惯，食物过敏和敏感性，寄生虫感染，或药物不良反应。

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The causes of IBD are not always clear but may include poor diet, food allergies and sensitivities, parasitic infections, or adverse drug reactions.

鸡传染性法氏囊病的原因并不总是很清楚，但可能包括不良的饮食习惯，食物过敏和敏感性，寄生虫感染，或药物不良反应。

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