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DISTINGUISHING PATHOGENIC ORGANISMS. Pathogenic organisms can be macroscopic or microscopic Macroscopic organisms: can be seen with the unaided eye Microorganisms:

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Presentation on theme: "DISTINGUISHING PATHOGENIC ORGANISMS. Pathogenic organisms can be macroscopic or microscopic Macroscopic organisms: can be seen with the unaided eye Microorganisms:"— Presentation transcript:

1 DISTINGUISHING PATHOGENIC ORGANISMS

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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