![]() In the widest sense, infectious diseases are caused by microorganisms that include parasites, fungi, protozoa, bacteria, mycoplasmas, chlamydia and viruses. These diseases cannot be passed from bird to bird and members of the flock must share a common experience for individuals to contract these non-infectious diseases. Infectious disease caused by micro-organisms such as bacteria and viruses.ĭiseases that result from nutrient deficiencies, consumption of toxic substances and physical damage are referred to as non-infectious diseases. ![]() Internal and external parasite infestations such as lice and worms.The consumption of toxic substances such as poisons. ![]()
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