Pathogens

• Communicable diseases are spread from person to person. they’re infectious
• Communicable diseases are spread by pathogens
• Pathogens are microorganisms that cause infectious diseases
• examples of pathogens:

  bacteria

  Virus

  Protists

  Fungi
• How do bacteria make us ill?

  once inside body, they reproduce rapidly

  Then release harmful chemicals called toxins

  Toxins damage tissue and makes us feel ill
• Viruses cannot reproduce by themselves, they can only reproduce inside of a host cell
• How do viruses damage cells?

  Virus invades host cell

  Virus reproduces inside the host cell

  This is damaging to the cell. the virus leaves the cell, which can cause it to burst open and die
• How can pathogens be spread?

  in the air

  In water

  Direct-contact
• How can we prevent/ reduce the spread of disease?

  Washing hands

  Vaccinated

  Pesticides

  Isolation