L1 - Pathogens

• Not all microorganisms cause disease. The microorganisms that cause disease are called pathogens. These microorganisms can be pathogens:

  • Virus
  • Fungi
  • Bacteria
  • Protists (single celled organisms)
• Bacteria consists of a cell wall, a flagellum, a cell membrane, cytoplasm and genetic material (DNA/RNA). There is no nucleus.
• Viruses consist of antigens, a protein coat and genetic material (DNA/RNA)
• Diseases can spread by:

  • Aerosol/droplets
  • Bodily fluids
  • Contact
  • Contaminated water
  • Contaminated food
  • Insects