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DISTINGUISHING PATHOGENIC ORGANISMS

DISTINGUISHING PATHOGENIC ORGANISMS. Pathogenic organisms can be macroscopic or microscopic. Macroscopic organisms: can be seen with the unaided eye Microorganisms: cannot be seen with the naked eye Pathogens: any organism that causes a disease

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DISTINGUISHING PATHOGENIC ORGANISMS

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  1. DISTINGUISHING PATHOGENICORGANISMS

  2. Pathogenic organisms can be macroscopic or microscopic • Macroscopic organisms: can be seen with the unaided eye • Microorganisms: cannot be seen with the naked eye • Pathogens: any organism that causes a disease • Most pathogenic organisms are microscopic or just barely visible to the unaided eye • Microscopic organisms include: • Bacteria • Viruses • Fungus • Parasites

  3. Bacteria • Cocci: spherical-shaped • (ex: Streptococcus) • Bacilli: rod-shaped • (ex: Clostridium) • Spirilli: spiral-shaped • (ex: Treponema)

  4. Virus • Can be seen with an electron microscope • Contain DNA or RNA • Use the host cell to replicate • Examples: • Hepatitis • Human papillomavirus (wart virus) • Hantavirus (Korean hemorrhagic fever virus)

  5. Fungi (Mycology) • Microscopic • Approximately 100 species are human pathogens • Infects humans by inhalation or inoculation • Examples: • Yeast-Candida albicans • Dermatophytes-Tinea capitis • ringworm of the scalp

  6. Macroscopic Organisms • Parasite examples: • Cestodes: Pork tapeworm • Ex: Taenia solium • Nematodes: Pinworm • Ex: Enterobius vermicularis • Trematodes: Intestinal flukes • Ex: Clonorchis sinensis

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