All of the following cause poultry diseases, except

Reason: There are a number of diseases prevalent in poultry. The diseases are caused by organisms like virus, bacteria, fungi, parasites as well as other nutritional deficiencies (i.e. lack of some important component in the feed given to them; may be proteins, carbohydrates, fats, vitamins or minerals). Algae are a group of simple autotrophic organisms (auto - self; trophic - nutrition, i.e. they make their own food from CO₂ + H₂O in the presence of sunlight and chlorophyll). These autotrophic organisms do not cause any disease in the poultry fowl.