DISTINGUISHING PATHOGENIC ORGANISMS

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DISTINGUISHING PATHOGENICORGANISMS
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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

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Bacteria

• Cocci spherical-shaped
• (ex Streptococcus)
• Bacilli rod-shaped
• (ex Clostridium)
• Spirilli spiral-shaped
• (ex Treponema)

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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)

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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

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Macroscopic Organisms

• Parasite examples
• Cestodes Pork tapeworm
• Ex Taenia solium
• Nematodes Pinworm
• Ex Enterobius vermicularis
• Trematodes Intestinal flukes
• Ex Clonorchis sinensis