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KEY CONCEPT Germs cause many diseases in humans. - PowerPoint PPT Presentation


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KEY CONCEPT Germs cause many diseases in humans. Germ theory states that microscopic particles cause certain diseases. Germ theory proposes that microorganisms cause diseases. proposed by Louis Pasteur led to rapid advances in understanding disease. Koch’s postulates support the theory.

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KEY CONCEPTGerms cause many diseases in humans.


Germ theory states that microscopic particles cause certain diseases
Germ theory states that microscopic particles cause certain diseases.

  • Germ theory proposes that microorganisms cause diseases.

    • proposed by Louis Pasteur

    • led to rapid advances in understanding disease


  • Disease-causing agents are called pathogens.


There are different types of pathogens
There are different types of pathogens. diseases.

  • Bacteria are single-celled organisms.

    • cause illness by destroying cells

    • release toxic chemicals


  • force host cells to make more viruses

  • very small


  • Fungi can be multicellular or single-celled.


  • Protozoa are single-celled organisms.


  • Parasites are multicellular organisms.



Pathogens can enter the body in different ways
Pathogens can enter the body in different ways. diseases.

  • Pathogens can be transferred by direct or indirect contact.

  • Indirect contact does not require touching an infected individual.

  • touching an infected surface

  • breathing in infected air


  • Direct contact requires touching an infected individual. Includes:

    • kissing

    • sexual intercourse

    • hand shaking

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