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Animal Health. Parasites Their Life Cycles and Classification. Infectious Agents Causing Disease can be divided into Three General Groups:. Bacteria Viruses Parasites. Bacteria . Simple plant life Microscopic Can be Pathogenic and beneficial Live outside of host
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Animal Health Parasites Their Life Cycles and Classification
Infectious AgentsCausing Diseasecan be divided intoThree General Groups: Bacteria Viruses Parasites
Bacteria • Simple plant life • Microscopic • Can be Pathogenic and beneficial • Live outside of host • Sensitive to antibiotics
Viruses • Are Ultra-microscopic • Live in tissue of host cells • Are resistant to antibiotics • highly contagious
Parasites • Live in, on, or at the expense of the host. • Infections develop slowly • Difficult to eradicate completely • Animals do not develop resistance • Animals may not show symptoms • Host-specific • Include fungi, protozoa, arthropods, and helminths Bot fly common horse parasite
Cause tissue damage Absorb nutrients Suck blood and lymph Obstruct passages Causes growths General irritation Secondary infections Cause serious economic damage The Parasites in this Group
Non-infectious AgentsThat Cause Disease • Chemical and poisons • Poor Nutrition • Injuries • Physical stress from breeding, conception, lactation, and birth • Any other stress or trauma that weakens the animal or its immune system to secondary infections
Nutritional Defects Result from unbalanced diets Physiological Defects Improper functioning of body parts Morphological Defects Physical disabilities Pathogenic Organisms Tiny living things capable of causing disease Causes Of Disease
Ticks Tick infested horse