Veterinary
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Disease: Communicable condition which usually causes illness or a compromised condition. One example would be Pasteurellosis.
Disorder: Non-contagious condition causing abnormal conditions to occur. May provoke disease as a secondary effect. An example: Entropion.
Parasite: Organism which can cause disease or disfigurement. Example here would be Eimeria spp. (coccidiosis being the resulting disease.)